Okay this is a strange bug but I can see the miner pogram any more,
the window refuses to show up. and no its not minimised,
Restarted my computer and did a crap load of things. I still dont get the window.
If you have a few cards mining with dummy plugs, guiminer might be opening up on the dummy plug "monitor" as such there is no monitor but a virtual screen you cannot see.
Happened to me, I disabled w/e adapter in CCC, then guiminer popped up on my main monitor.
Edit:
Of course, re enable it.