[Solved] Microsoft Office PowerPoint Splash Screen "stuck" on screen
Apparently some application called QuickLook gets stuck.
Happily, it is stored somewhere with "Mic" in the name.
By opening terminal, and using the lsof (List Open Files) command, and filtering the list to just things with "mic" (case-insensitive)
with a grep -i "mic" , we find various Microsoft Office pieces running.
Since the thing has a giant red P on it, I guessed it was part of the PowerPoint Application and killed that:
with kill -9 #processid
in this case:
kill -9 1890
And poof it is gone :-)