Well, after some extensive revision hunting, the strange keyboard bug some people (notably VBox users and people on RHW) has been traced to r41291 (the commit that activated USB keyboard and mice support)
 
Now, i know this isn't an "important" bug, but it's a bug none-the-less. It's up to the devs to decide what to do with it, but i thought it was worthy of looking into.
 
Also, rather interestingly, this bug seems to be restriced to debug builds only. The (very few) release builds i have tried seem perfectly free of this bug,which seems rather stange to me.
 
It's getting rather late now, but i'll probably try and get a debug log of r41291 sometime tommorow, so i'm sory i can't do any more tonight. Please post here with your experience of this bug! :)
 
Yours sincerely
 
Joshua Rice.