Draftsight 2020 - 'Sticky' Mouse Pan

I've got a problem with the middle mouse pan button sticking when i pan i.e. Pan remains active after i release the button. It happens around 50% of the time and it's driving me crazy. 

I'm using 2020SP1 and only really noticed it after the last update. I've got no issues at all with any other software (Blender, Sketchup, Autocad, Affinity Photo/Designer....) and have been using DS for years. My mouse is a logitech MX Master but i've tried uninstalling the Logitech Options and used a wired MS Optical mouse but get the same issue.

Fully up-to-date Win10 with Ryzen 3770x and RTX 2080ti.

Any suggestions/support would be very gladly recieved.