Sorry I should have been more careful while describing my issue. Yesterday I was updating avast and while I rebooted first thing I had was the UI on my desktop…OK I closed it than on next reboot again the same and this is happening since few updates, but this morning I rebooted and no issue.
As far is avast in the system tray I meant avast icon nothing else, sorry I was tired I should have thought of what I was describing.
It’s good for now, next time it happens I will take a screen shot.