Invisible app problem

[petemc]

For some completely random reason both Firefox and Safari have turned invisible. I've rebooted and theres no change.



You can see there that its invisible. Theres a tooltip which is from a webpage being displayed. When I move over some areas the caret appears for the address bar too. Theres just no reason for this to happen that I can think of. I haven't installed anything new. AFAIK Firefox doesn't use anything that Safari does. Opera is so far unaffected but I need FF really.