I just started using Fab-Filter Pro-L in Wavelab and there is a GUI issue upon inserting it.
At first insertion, the GUI is slightly warped looking, and some controls can’t be changed unless you guess where they really are (the gain is most obvious problem). Moving to another plugin and back to Pro-L, or moving from the normal to compact version and back to normal also fixes it.
This problem happens even when Pro-L is the only plugin on a clip, track, or master, or if it’s in a shared window with other plugins. It also happens with VST-2 and VST-3 the same.
Screen shots attached.
Wavelab 8.5.10 (64-bit)
32 GB RAM