@sharke UPDATE: I now find out that there is a "safe mode" which stops these glitches. However, I really think f.lux should come with more of a warning to users that it may affect things like graphic or audio work. Last night I posted this tip on a few audio production Reddits and the response was overwhelming. I got almost 100 replies, many from people saying they've been tearing their hair out trying to get to the bottom of these audio glitches. They can send you mad if you work with audio, and f.lux isn't the most obvious cause to people who have installed it and forgotten about it.