It seems that their VST version has some drawing issues, but the VST3 version works just fine so for now - simply replace your VST plugins with their VST3 versions.
See the attached image that is from a VST3 plugin window.
I would encourage you to report this issue to them as well.
Thanks for the prompt replies. For some reason, the VST3 WaveShell keeps getting deactivated for not initializing, so I’m not able to access the VST3 versions of my Waves plugins.
I am not sure I understand what that means, but if you are having problem with authorizing or activating a plugin your best bet is to contact the plugin developer.