Hmm.. for a signature don't you just put in the code? Or.. can't you just put in the code yourself? I've always done this and never had a problem. Why not try it that way first and let us know if that doesn't work and then we can direct Chaz's attention here.
I just recently added and changed my signature just fine. Maybe I'm not completely understanding the problem. Do you want to PM me the link and see if I can do something about it?
Also, is there really a limit of 500 x 100 pixels or 19.5 kb's on signatures? Looking at some of them on here, I know they are bigger than that. Do they just upload the larger sizes anyway?
Well, we don't accept huge signatures, but something over the 500x100 would be fine. There have been occasions when members have been asked to make them smaller, etc., but for the most part everyone's is good.