I'm having problems uploading a CursorXP theme I've put together. I'm uploading the theme in a .zip file, together with a screenshot in .gif format. I get a message saying that I'm uploading a file with an invalid format! I've managed to upload it to other sites, such as DevArt and DeskMod, so I know the file's fine. Please help!

The first couple of times I tried, I first got an error message saying my browser couldn't locate the page 'upload2.asp', and then a message telling me I didn't have the right access levels to upload files and I should log out and back in again. This is like banging my head against a wall.

Hopefully this won't stop me updating my GUI Olympics skins, as that just wouldn't be fair...