Re: I did upgrade recently
I had this on my Father's tablet.
There are purportedly 4 fixes for this. Th 4th being a re-install.
The first two didn't work for me
The third was to create a new user (local only user is fine) then reboot. Then remove the new user.
- This worked.
- It did happen again though, about a month later. *touch-wood* it hasn't / won't happen again.