Originally Posted by MRMJP
FWIW, Unfilled plugins have VST3 GUI issues in WaveLab too.
It's hard to say if the fix should be done in the plugin or if somehow the DAWs are the cause, but maybe you could post on the WaveLab forum as well?
I reported this to Andre from the Plugin Alliance beta team (I do beta testing for both WaveLab and PA).
Thanks for helping us test our plug-ins!
From what I can tell, the Wavelab issue may be separate. The GUIs are not appearing at all in Wavelab, where Reaper cuts off the top half.
We've done a few tests with trying to get Reaper working again, including completely removing OpenGL rendering from our plug-ins. Nothing so far.
The major oddity in Reaper is that loading a VST2 version of our plug-ins *first* results in the graphics bug not happening when a VST3 version is loaded. Since this behavior first appeared in Reaper 5.24 (" + VST: improve resize and UI behavior with various VST3 plug-ins (including MeldaProduction and Melodyne) [t=180334]"), this leads me to believe that it may possibly be a Reaper conflict.