OSX Yosemite GUI bug

I just updated the studio MacPro to Yosemite.

In C8 32 bit some plug-ins (Slate FGX, UAD) closing the Plugin window (with the red button) gives a black window which can’t be got rid of. Waves plugs seem OK.

Ideas please?

Hello,

please see this post:
http://www.steinberg.net/forums/viewtopic.php?f=233&t=77989#p450866

Kind regards,