Plugin Won't Open - Bug?

I’m in the middle of a mastering session, and all of a sudden, on the 7th track, my plugins stop opening correctly. It will open the window, but the interface will be missing entirely (I’ve attached an screenshot of what pops up). I tried re-opening Wavelab, restarting my PC, tried different plugins in different spots. I couldn’t resolve it. Does anyone know why this is happening or how to stop it?
WavelabPluginWontOpen.jpg