A heads-up that the lastest Firefox update seems to have clashed with something on Xenforo and some of you will notice the 'upload file' button has gone white. I may try and fix this with a sticking plaster of code that I'll have to remember to remove later, or may just wait a little while and see if XF &/or FF come up with a little patch soon. In the meantime - the button works. It's just empty.
Ah, looks like FF may have already fixed in version .50. (Coming very soon I think) Still rebuilding search cache so will double check after that's finished.