And I'm sure if you ask nicely, a Mod will be happy to come along and kick this thread over to the proper forum. That being said, I'll start with the first round of silly questions.
Are you using the right format? (Should be .bmp or .jpeg/.jpg)
Are the files the right size? (Usually about 96-100 pixels square will do)
Are you uploading this from your computer or from a host site? (Host sites usually work out better for me personally, oddly enough)
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