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Showing developer posts only. Show all posts in this thread.
This is caused by something running in the background attempting to take focus.
The number one culprit lately has been Music Match. If you have ever had Music match on your system it leaves a procees that runs at startup.

Look in your process tab (Ctrl-Alt-Del)
There should be a process called MM.exe or some such.
If you cancel that it should relieve your problem.
 
All part of the service. :)