Forum:It won't let me log in :(

Up untill a week ago I have been playing tekkit minecraft fine (bought version obviously) untill it did an update. When I next went on it had reverted to normal minecraft (without any tekkit additions) and had deleted everything that had been made with tekkit items. The rest of the world is fine just minus tekkit.

Then when I tried to log into this site it doesn't recognise my username despite the fact that it does let me log into the game.

Any help would be much appreciated,

Thanks =D