If you have cookies turned off, the site registration and login don't work but with very unhelpful error messages. For example, login just goes back to the login dialog; registration returns the error "Please re-recognize the word shown in the image." So, I suggest having a test for cookies and a specific error message saying that they need to be on.
Posts: 2258
File bugs for these, they should be fixed. http://sf.net/projects/gallery/
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