"Ganonmaster" said ...Never mind, it might be good for now. There was a problem on my end, something to do with cookies. If I run into it again I'll PM you. I'm sorry for jumping to conclusions and blaming you, have a great day.
You're jumping to conclusions. The username system on SFMLab has not changed and no new username restrictions have been added. I suspect there's something else going on. Please send me a PM with your email address and username so I can sort this out.