Issues with RGB pallette and outline thickness

Hi dear community,

a few days ago, I've encountered a still re-occuring issue with my RGB pallette. Almost every color swatch is either black, green, red or blue. I don't see any of the true colors, neither does it change the color of an object correctly (You can see the faulty pallette down below). Furthermore, I have troubles with chaning the thickness of an outline. As standard, 0,2mm is selected. If I want to change it in the drop-down list, it doesn't change the outline. When I then re-select the object, it displays 0,2mm again.

I already contacted Corel Customer Support, but the advices they gave me didn't work at all. (Delete temporary files, F8 + program boot, etc.)

So I really hope that you guys can help me.

Best regards