Bug With Windows 8, IE10

I'm sure that I am missing something obvious, but I can't find a way to include an image in a post. So I've uploaded one to: http://www.ijack.org.uk/bug.png

That pull down menu appears all the time. The same thing happens on two Windows 8 computers, and comptibility mode makes no difference.
 
If this helps - I am seeing same, Windows 7, IE 10. Compatability mode does not help (even makes the things worse).

Another "feature" with IE10 - "new messages" indicator box (sitting on the right, above "Ask Community") went missing as well.

This all started from couple of days ago.
 

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