When I start foobar2000 everything is ok.

But after I minimize and maximize foobar2000's window it looks like this:

I'm using sabertooth theme ( WB v7.19) and I have win7 x32.
Any solution?
LE: If I use Aero window frames and not the theme's frames the problem is solved. But I don't want to use Aero...
I didn't have this problem in WB v7.1. Should I go back to v7.1 or you'll release an update soon?