I had the same problem yesterday - tried loading a new avatar from file - dint work - tried this morning where I have uploaded a new one to a www address - worked fine.
if you send me your avatar - I will upload it to my domain and send you the address - you should be able to upload it then.
The majority of avatars stored on the DSC server are working OK - however some are not (including webteam !) - I'll look into this later tonight.
Avatars hosted on external servers, don't seem to be affected.
In both cases, avatars must be JPG type files - previously we had both JPG and GIF, but we have found performance problems with some of the GIF images and so we have changed the board to only accept the JPG versions.
If anyone is having problems uploading their avatar onto the DSC server, email it to webteam quoting your board name and we can load it on your behalf.