I’m having lots of issues with VST plug-ins since upgrading to Cubase 8 (x64). One such issue is the ‘Always on top’ toggle in the VST effect window when Native Instruments GuitarRig 5 is loaded. Simply toggling this option causes the plug-in to crash and Cubase to report that it’s lost the VST bridge connection.
Windows 8.1 x64
Intel Core i7-4770 @ 3.4GHz
I’ve attached some screenshots.