Why can't I change my signature pic?

The pic is 384x200 and 6,28kb, so it shouldn't be a problem. but when I click "upload" nothing happens..the screen just refreshes.

EDIT: I can upload it, but it won't show the pic! (this image can't be displayed message)

I just changed my signature pic, so I know the solution. After you click upload, then you must click insert signature picture, then click save signature. If that doesn't work, try saving it in a different image format, I know that jpeg will work for sure.

Sorry but it just doesn't work.
It says "Your current signature picture" but it doesn't actually show the pic.

Hmm.. I can't seem to give you a signature at all.

...looking into this now.

Tnx ^^

It would appear that all of your new posts have the signature. :)

I think this happened to me too.. if you change your signature later, it should update across all posts, however when you first get one, it doesn't.