2. there's corruption (3 thin horizontal lines) as I scroll down the files panel:
i cant reproduce this. Which skin are you using and could you try with the MusicBee3 skin? Also how do you action the scroll (eg. mouse wheel, drag of the scroll slider)
and does scrolling fast or slow make any difference (especially the slow scroll, click on the top/bottom scroll button)
lastly, scroll direction might be relevant as well - does it happen both up and down?
I'm using the skin Dark|Sunset but it occurs with the MusicBee3 skin too.
It's always reproducible:
it occurs right after I press Ins(Scan Folder For New Files):
when the procedure completes, if I scroll down using mouse wheel, then it always occurs.
The corruption remains if I scroll up(=it doesn't get fixed) but no further corruption is created when scrolling up.
If it occurs once, then even if I close and restart MusicBee, then the corruption occurs even by simply scrolling down.
Also, I confirm AvikB's report about using the scrollbar to scroll.