I have the same issue. I also see a small cog icon in the menu bar whenever I do something like switch apps or chrome tabs. I guess it's an indicator of ghostnote activity, but its sometimes to the left of the ghostnote menu icon, sometimes right and sometimes a couple of app menu icons over...

Of more concern is that after installing I noticed moving finder windows around as sluggish and sometimes just the system cursor in general. If I quit the app, that goes away.

Those issue are making it unusable for me.