New windows (partially) blacked out

Joost1

Bit poster
More often than not, when a new window is opened in my Windows 7 guest (coherence mode), whole or part of the new window is blacked out. I have to manually move the window before it displays ok. Any ideas why this is happening and how to fix it?

Screen Shot 2015-04-29 at 8.14.17 .png
 
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