If you can't upload your icons, try some of the following:
*check the file size - is it within the allowable 140 x 140 and 40k in size?
*is the icon either gif or jpg, if not resave it as that type of file and try reloading.
*rename the file, this works most of the time
If none of the above works, email your icon, with your User name only to: email@example.com and one of the Graphics team will be happy to upload your icon.