Please Fix!

Very addicting game! But when I log in to old servers Ive been to, it says that my nickname/alias has been taken already! Even though I had that name!!! Please fix these bugs or this stuff! I have a server with ALL my unknowns in it, then I cant log in to it!!! Please, please, please! Fix!

Scalabengbeng about The Blockheads, v1.6.2