When Roon plays music on my Mac-pro 2013 (1TB SSD, 32 GB RAM) while I work at the same time in Microsoft Word (v16.9.1) the pointer constantly vibrates erratically. Familiar? Any suggestion?
Doing the same thing right now on a late 2012 15" MBP w/1TB SSD, 16 GB RAM, macOS 10.13.3, Word v16.9.1 with no issues. Not sure what to make of that, sorry!
Just to clarify, is it the text cursor inside the word document that is moving erratically or is it your mouse pointer? If it is your mouse pointer, does the behavior continue when Microsoft Word is open in the background and you are using another application?