OK - The white rectangle is not corruption. It's supposedly a background app by MSI called MGSysCtrl.exe, called System Control manager. I suspect without multiple displays it's hidden off the screen desktop, but when DisplayLink displays extend the desktop, it can't hide anymore and appears at the desktop position 0x0 on the primary display.
Think MSI will need to fix this as their method of hiding the app doesn't work when multiple displays are enabled.
Wim
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