You have specified an incorrect or inactive username, or an invalid password.

As the title says, one of my forums will not let me log on, and I know the username and password is 100% correct.

I can log into the util restore tools no probs, but that doesn't help as it still says I entered a wrong username or password when I try to log onto the forum or admin panel... I'm getting very frustrated.

Make sure that your caps isn't on. Also you can also check this link out here

Come on man, I'm a C++ programmer, do you honestly think I wouldn't realize I had caps on?

Sorry didn't know. Just the link I gave you before.

For some reason the stored username that I've been using for a week, had changed somehow, and replaced a " " (space) with an "_" (underscore), that was the prob.

Fixed.