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My registration script allows uploading of a user photo of modest size (<100k). Occasionally, all I get is a white screen when I submit the form. This is remedied by clicking the IE back arrow and resubmitting.
Sometimes it happens other times it doesn't so I'm finding the exact problem hard to pin-down.
if your php isn't set to E_ALL for errors, and also isn't set to display errors, you can often get this kind of problem (if there are unexpected errors somewhere in the process) ... I can't think of anything else right now..