Hello!
I think I found a bug, you may have heard about it, and if so, I'm sorry.
From time to time the tooltips that appear when you hover over the settings in the ASS window get "stuck" to your mouse, and don't leave unless you quit the game (I didn't find another method, the tooltip stays even in the main menu).
I know how to reproduce it. It may not be very scientific, but what I do is:
1. Launch vessel
2. Open ASS settings window thing.
3. Hover over one of the settings until the tooltip appears.
4. Spam the crap out of left and right click, and move the mouse violently over the entire window.
5. ???
6. Profit? (Hopefully)
I am using the 1.4 version. I did not find any output log files..?
I hope that somehow points you, through developer magic, to the problem.