Please can you suggest what else i can do to try and resolve my issue with the pan tool 'sticking' with the middle mouse button. I've tried all the standard DS fixes suggested by @PM in my previous post but no one has followed this up. Additionaly, following this advice has introduced a huge lag with the cursor when panning/drawing etc and the mouse button pan issue remains. Are there any known issues with DS2020 and Geforce RTX GPUs?