This is an annoying issue I’ve been trying to find the answer to for a couple of days.
I get a quick flash on my screen with a black box which looks like a command window. I finally had this happen on a slow enough computer where I could see where it was running from. See below.
To fix this issue, do the following:
- Open task scheduler from the start menu
- Find Microsoft Office under tasks
- Disable OfficeBackgroundTaskHandlerRegistration
A fix from Microsoft on this issue is underway.