It's probably best to check with the maker of the pen tablet to see if they have updated drivers for it.
What brand and model is the tablet?
What operating system are you using?
Thanks for your reply. I have checked with Trust - they say it must be an issue in Photoshop CC...
I use a Trust TB7300 and have windows 7
Usually it turns out for tablets that aren't mainstream that they just haven't updated their drivers to work with photoshop cc.
For example, most people don't have problems with wacom tablets in photoshop cc.
One other thing that could possibly be the cause besides the tablet driver is your graphics card driver.
If in photoshop cc you go to Edit>Preferences>Performance and turn off Use Graphics Processor and then restart photoshop cc, does that make a difference?
If it does then perhaps your graphics card driver needs to be updated from the maker of the card.
(not through windows updates)
Thanks again for taking your time! I reinstalled the drivers for my tablet, and the issue disappeared! So it was some kind of errer there, even if I had the latest one.
My tablet is rather old, so I might just update to another bradn and model eventually! Thanks again!