Some plugins not working properly in cubase

After installing some plugins I open them and the plugin screen is just black. The presets are still working. How can I fix this?

Hey pal… Need LOTS more information… OS? Version of Cubase? Intel vs M1 if Mac? Which plugins?

OS Mojave 10.14. Cubase 10.5. I have this trouble with for example CamelCrusher and Fire Cobra.

typically that needs to be addressed with the plugin manufacturer

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Does that mean that I need a license? It’s no where to registrer as far as I can see?

No, it means you should contact the plugin author .