could you try temporarily removing the visualiser and then the wavebar to see whether that makes any difference. If it does, i would be interested to know if the addresses the minimise/ restore as well
But, some brain cells sparked, and I tested it again with the default MB skin, and it doesn't happen there.
So it seems related to the skin.
I tried my other skins too, but they all seem fine.
This only happens with 'A Sophisticated Bee'. So I will probably have to find an abnormality in the xml of that one that causes this.
Maybe an 'illegal' transparency value somewhere?
Thanks for putting time in this, I'll report back when I found and fixed the culprit.