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Had the same issue and re-install the software didn't fix the issue for me, I had to roll back Windows to the previous state. I too noticed regular mouse worked fine, but noticed the freezing got worse once i loaded my on screen keyboard. the cursor wouldn't move, then it would shoot across the scre...

After installing today's Windows 10 new OS update SmartNav became uncontrollable. The cursor is real sluggish and freezes and jumps all over the screen, Uninstalling the software and drivers and reinstalling them does NOT fix the issues, was forced to roll back the version of Windows.