Strange colors/blue-fringed mouse pointer on full-screen YouTube when f.lux is active

  • Deleted off topic posts, please keep it related to reporting bugs.

  • I have this problem as well, at least since the summer of 2015 but probably longer. However, closing flux doesn't help me. Tried closing it and rebooting Safari without flux but I still got this problem.

  • I found that when I activate (and then deactivate if I want to) another of my extensions I don't get the overlay colour disruptions when I go to full screen. (Limited testing has been done.)
    EDIT: Seems to work ok on youtube, not on netflix.

  • Same problem on full screen youtube videos when I don't move the mouse for a few seconds.

    MacBook Pro (Retina, 13-inch, Mid 2014)
    Intel Iris 1536 MB

    El Capitan 10.11.3

  • Hello, this is happening to me too, MacBook Air (13-inch, Mid 2012) with Intel HD Graphics 4000 on OS X 10.11.3 (15D21).

  • Also happening to me:
    MacBook Pro (Retina, 13-inch, Mid 2014) Graphics: Intel Iris 1536 MB
    El Capitan 10.11.4 Beta (15E27e)

  • It seems it was fixed in the latest (today) update?! At least YouTube is ok at this moment.

  • @Adrián-Mihálko Not for me (MacBook Pro Retina, 15-inch, Mid 2015 with Intel Iris Pro 1536 MB).

  • There seem to be several threads about this so I'll chime in on this one as well. Same problem.

    MacBook Pro (Retina, 13-inch, Early 2015)
    Graphics: Intel Iris Graphics 6100 1536 MB
    OS X El Capitan 10.11.3 (15D21)

    I've just installed the most recent f.lux update (36.6).

  • 8 months and still not fixed...

  • Hi! I've made a topic about this problem in Apple Forums. Please comment there and let them know that they need to pay attention to us!

    And report it through product feedback

    We need to get their attention, wa lot of people need to talk about this problem.

  • did i miss an update? running 36.6 and it is still happening.

  • Same problem, started when I upgraded to El Capitan a couple weeks ago.

    Macbook Pro Retina (Mid 2012) HD 4000
    Safari 9.0.3
    Flux 36.6
    I hadn't updated my OS until El Capitan, I think it came with Lion. I see from the thread this issue has been longstanding but my old OS did not have this issue, the update to El Capitan is definitely when it started for me.

  • @seajay Oh yeah, that's a great video for demonstrating the issue. Seeing more distortion on this than most other vids.

  • Same problem with my MacBook Pro Retina mid-2014 Intel Iris

  • I have the same problem with my MacBook Pro 13" Retina 2015 (running OS X 10.11.3).

  • Me too.
    OSX 10.11.3 (15D21)
    Model Name: MacBook Air
    Model Identifier: MacBookAir6,1
    Processor Name: Intel Core i7
    Processor Speed: 1.7 GHz
    Number of Processors: 1
    Total Number of Cores: 2
    L2 Cache (per Core): 256 KB
    L3 Cache: 4 MB
    Memory: 8 GB
    Boot ROM Version: MBA61.0099.B21
    SMC Version (system): 2.12f143

  • I've got a Mid-2015 13" Retina running 10.11.3, Flux 36.6 with the Intel Iris 6100 doing this exact issue.

    I can reliably reproduce this when running in the default "looks like 1280x800" Retina mode. When I change to the "more space" 1680x1050 mode, the issue goes away (and vice versa) - I guess that's why I haven't noticed it until recently as I usually use the more space mode.

  • Same problem here on a 2015 MBPr with Intel Iris Pro. The problem goes away when I disable automatic graphics switching and use the Nvidia card.

  • Same issue.

    Flux 36.6
    MBA 2014 (hd5000) -- OS X 10.11.5

  • The f.lux team hasn't replied on this topic in 9 months. Is anybody working on fixing this problem?

  • There is a bug in to Apple, but this is way below us in the system.

    All we can do is recommend you disable f.lux while playing a movie.

  • This happens on a Retina MacBook too (2015) with H5300 graphics, and OS X 10.11.6.

    Has anyone seen this issue in MacOS Sierra too?

    I'm guessing this won't be resolved without Apple's input, and/or if Apple introduce Night Shift on MacOS..

  • Just thought I'd say that this bug is still active with HD graphics 4000 on my mid 2012 macbook pro.

    When I use gfxcardswitcher to force discreet card while using youtube the issue does not appear.

  • Same issue as mentioned by users.

    This issue is while I play fullscreen videos on Youtube, Udacity. Whites are blown out, blue hues here and there, if you move the cursor the problem goes away for a while and then comes back.

    Also this is not just in Safari, it does the same in Chrome too.

    I am running
    f.lux version 37.7
    MacBook Pro (Retina, 13-inch, Late 2013)
    Intel Iris 1536 MB
    OSX version 10.11.6 El Capitan

    This annoying bug has been reported a year ago and it is sad to see that there is no fix yet. I have used F.lux on windows for long and this bug on Mac is kinda making me look for alternatives to F.lux which I really don't want to do.

    Please try to fix this.

  • @shinz4u Agreed, it's a very disappointing lack of action.

    It makes the program completely useless in my opinion. If I have to keep turning it off, it is doing me no good in terms of helping with my body's sleep cycle confusion.

    Flux replies so far have indicated there will be no fix. I'm still following the thread and hoping they sort it out, but it doesn't seem like anybody cares or is working on it. Can anybody recommend a different program? I give up with this.

  • I've gotten around the issue thanks to this little app: Shady for Mac.

    What's a little strange but very good for this specific purpose is that just running the app with the "shade" setting off still fixes the problem. I'm guessing it's doing something similar to gfxcardswitcher in the background, as soon as it's running, so it's probably affecting battery life too (although I haven't paid attention to that myself).

    And of course, turning the thing actually on and reducing the brightness to a minimum ain't bad for your eyes either.

  • This post is deleted!

  • I worked around this by creating a file named safari.css, a text file with these contents:

    .ytp-fullscreen video {
      opacity: 0.996 !important;

    Then in Safari preferences > Advanced, you select that file for the Style sheet setting.

    If you want to experiment, every time you edit & save that file, you have to reset the Safari preference back to None Selected and then back to your file.

  • My solution might reduce battery life a bit, hopefully it's not noticeable.

  • You could add Netflix to it if you want:

    .ytp-fullscreen video, #netflix-player.player-cinema-mode video {
      opacity: 0.996 !important;

  • @chris-l

    Hi, is there such a preference in chrome for mac that I can change to get a similar solution?

    Thanks a lot

  • @shinz4u Sorry, not sure about Chrome. There are probably extensions available that let you add your own CSS rules, but I haven't looked into it. I might publish my own extensions to make it easier for everyone.

    I actually am not using f.lux at the moment, but I calibrated my laptop display with a lower color temperature than normal, and it has the same bug that you get with f.lux -- videos have artifacts in the brightest parts, but only when they are full screen with nothing else composited on top of them. Maybe the video driver uses an optimization for this case that doesn't quite work.

  • @shinz4u I just figured it out in Chrome. Thanks @chris-l for the fix! This thing was driving me nuts.

    Quick guide for web devs: Just add opacity: 0.996 !important; to the HTML5 video element in Chrome's developer tools.

    Detailed steps for non web devs:

    1. Open a tab with the Netflix video you want to watch (haven't tried with YouTube, but same principle should apply).
    2. Open Developer Tools by going to View > Developer > Developer Tools (or by hitting alt+cmd+i).
    3. Click the button with the "arrow pointing into a box" at the very top left of the Developer Tools window to "inspect an element" (or hit cmd+shift+c).
    4. Click the Netflix video element to inspect it. This should bring up the Elements tab in the Developer Tools window with the "video" element selected.
    5. At the top right of the Developer Tools window, you should see a little section that says "" with a few list items underneath. Click the bottom of that section and add opacity: 0.996 !important; as a new list item.
    6. Go full screen and watch a beautifully artifact-free video.

    You'll have to do this every time you open a new video in Chrome, but it only takes a few seconds. I'm sure it can be done more permanently with an extension, as @chris-l said though.

    PS: Thanks to the f.lux team for a great piece of software! It's a lifesaver. I know this bug isn't your fault.

  • I'm even having this problem with the new update. Before everything was working fine, now i start seeing some difference on the white color when i'm full screen on youtube. After all the buttons hides, the color white become strange.
    I'm using MacBook Pro Mid 2015, Intel Iris Pro 1536 MB

  • Here, you can try this as a Chrome extension.

    I submitted one for Safari but they have to approve it. (Or reject it!) But if you know what you're doing the source code is here.

  • @chris-l wow this is awesome - thank you!

  • @herf where can I get older versions of f.lux? I didn't have this problem before I updated it.

  • @herf don't mind that, it seems to appear after Chrome is updated.

  • Whatever this is, I don't have this problem in the incognito mode, Safari and another user's Chrome. But the Chrome I use have this color artefacts.

    The above css fixed that. For anyone who's concerned about the reduced opacity I'd recommend using box-shadow, which is what I did with the Stylebot extension. Tested only on youtube.

    .ytp-fullscreen video, #netflix-player.player-cinema-mode video {
        box-shadow: 1px 1px 1px rgba(0, 0, 0, 0) !important;

    @chris-l I think it's better to use box-shadow in your extensions as well.

  • This post is deleted!

  • Thanks for the feedback, I will try to look into energy usage & see it it makes a difference. Also I should point out that the browser extension is applying the style to all videos, not just YouTube & Netflix. In future I might make it more specific again, though it does mean we would have to deal with changes to web site designs that break it.

  • Now Safari is just fine but Chrome isn't lol

    Safari has noa artifact whatsoever since I updated to Safari 10.

    Is it just me?

  • @chris-l thanks for the extensions! Does this apply to all videos, or only full-screen playback? I haven't tried it yet, but I think lowering the opacity would have some undesired effect on the color and contrast, no?

  • @Nirvanes said:

    Now Safari is just fine but Chrome isn't lol

    Safari has noa artifact whatsoever since I updated to Safari 10.

    Is it just me?

    Have you tried Netflix? Youtube seems to be a lot better but I definitely still get artifacts with Netflix.

    @chris-l The Chrome extension definitely works. Youtube looks absolutely fine. Thank you!

  • Thanks for the feedback. Yes the extension is applying to all videos, full screen or not. The opacity is only reduced by the smallest possible amount, so I would hope it has minimal to no perceptible effect. (Only 0.4% of the background color will be blended into the video). But yes there are other ways I could try -- like the box-shadow rule that was mention earlier. I think what we are doing is forcing the browser to render the video in a way that doesn't trigger the bug. Probably there are a bunch of ways to do it.

  • @mixolyd said:

    @Nirvanes said:

    Now Safari is just fine but Chrome isn't lol

    Safari has noa artifact whatsoever since I updated to Safari 10.

    Is it just me?

    Have you tried Netflix? Youtube seems to be a lot better but I definitely still get artifacts with Netflix.

    @chris-l The Chrome extension definitely works. Youtube looks absolutely fine. Thank you!

    Tried it a little, need to give it a go, but I didn't notice anything.

    Youtube is like it should right now, I just don't ironic that now that Safari is alright Chrome isn't... I only used Chrome to watch Netflix and Youtube at night, nothing more.

  • MacBook Pro (Retina, 13-inch, Early 2015) - Intel Iris Graphics 6100 1536 MB

    Have been having issues both in Chrome and Safari with this neon affect coming on while I am trying to watch Narcos... as well as in YouTube, at first I thought it was my computer graphics and was getting worried, but when disabling f.lux (v 37.7) the problem is solved. This is a bummer as I need f.lux to help me maintain my sleep cycle and I watch a lot of videos at night. I tried the f.lux fixer chrome extension, but it only worked for youtube

  • I'm having the same issue for Netflix and YouTube on Chrome. My OS is 10.11. Macbook Pro Retina 15 inch mid 2014. Graphics Intel Iris Pro 1536 MB. Problem goes away when I disable Flux.

Log in to reply