Plugin windows are blank

I have an intermittent problem with Wavelab 12 which I never experienced in V 10 or 11. I’ll open a plugin and the GUI is blank (as seen in the screenshot). The only way to fix this is to quit and relaunch Wavelab which is obviously a workflow problem. It seems to happen at random and not always with the same plugin ether.

I have also noticed that some other apps are acting strangely when Wavelab is running. For example, web pages and emails sometimes appear blank. As soon as I quit Wavelab, everything works as normal. Again not something I ever experienced using V10 or 11.

Any ideas what this could be?

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macOS or PC and any plugin?

regards S-EH

I hardly see any possible relation with WaveLab!

No you’re right, nothing to do with Wavelab, I think it’s a coincidence. It just started happening in Cubase as well.