I am having the exact same problem as others.
The registration email I was sent, was from 'us'.runesofmagic blah, and Im using the right login name and password that I just created and was accepted, yet the game isn't taking it as valid input. I know the 'region' is US because I just set it, though originally it was showing EU, which is flat wrong, given the email address sent to me as noted , was 'US'.
What's going on here ?
NVM I got it,,no idea why, but , even though my password HAD to be 12 characters, where I know I put a '2' on the end to get to 12, the password slot during login would not take it, so I had to leave off the '2', and I made it in. WEIRd ?
thx