Black rectangle

C

Christine.

Joined
Jun 11, 2010
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At random times apparently,A black rectangle appears on my screen it is fleeting i.e one or two seconds ,it looks like the Command prompt .
What is causing this ?

HP Pavilion Desktop PC
Windows 10
Thank you
 
I wonder if you've got some application that is running something in the command prompt, I occasionally see this when I use some older software that uses a mini server on my PC. Are you able to spot anything in the title bar of the popup when this happens, as it may give a clue.
 
I have had a similar problem but the application froze and I had to shut down and restart.
 
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