hmm, quite the problem.,
I didnt see any of your image waiting to be uploaded yet.
anyhow, simetimes it just might be your connection. (i had very slow connection once, and i could never get anything uploaded.,),
I did also come acorss myself being loged out after trying to access the adminpages to the gallery, but it was fine after re-loging.
fishy., you should keep tryn', thats all i can think of right now.