I have the same issue after the last windows 10 update
A grey border is displayed around windows element (start menu, notification pane, some modal windows,...) sometime, it's just the shadow that is not well placed (a few pixel wider than the element to shadow)
And another set of visual glitches :
- the login screen is messy A lot of flickering (image to black, black to images)
- the blur effect around the user/password does not cover all screen
- sometimes, no test is displayed (just a input field to enter pin)
- in the mac os top menu bar I see a lot (more than 20) small icon with an orange dot indicating that windows should be restarted to apply updates
There is not specific step-by-step, just run the windows update and all problem occurs.
I reinstalled // tools without any result.