Solved it.

"Display pointer trails" was enabled in my Mouse control panel object. With pointer trails enabled, the mouse cursor "sticks" momentarily to each viewport boundary while the navigation icons fade out/in.

Disable "Display pointer trails" to fix this issue.

Thanks for your patience!!

That's good news John, thanks for reporting back here on the results.

I haven't had a chance to dig down into that other display artifact yet, I'll try to look some more at that one after this next beta is out.

- Michael