I just had this bizarre problem happen to me a few minutes ago.
I had the white screen after uploading the picture and it wouldn’t insert the pic into the post.
I tried it in Safari though and it worked so I just quit Firefox and reopened it and voila – it works again. I know its completely weird but I was messing around with the lightbox thing but its probably not that that….anywho try completely quitting the application of restarting if necessary.
