The reply to my support ticket:
Quote:
Kerry-Anne Peters
Jun 10th '08 07:17am
Hello,
This issue can be caused by the file extension (.gif for example) not matching the file type. This can be caused by creating the file extension when saving the file when it is being created or downloaded or changing it from the default extension for the file type.
Kind regards
Kerry-Anne Peters
vBulletin Support
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I'm not sure if this applies to the picture that I was using or not, but it's an answer.
Thank you Kerry-Anne and Marco.