Mouse shadow and UPLAY

It's so nice to find good software like this, as Synergy has been acting out since the Win10x64 Creators version (the mouse buttons stop working on the secondary PC forcing manual constant restarts of the software). 

So I tried Multiplicity, and it seems to work like a dream. Except it leaves a shadow at the corner on the main PC as it moves over to the secondary. No big deal, but irritating, I hope you can fix that. And then I noticed it crashes (!) Uplay. So, uninstalling until fixed and going back to the inferior Synergy...