I only input my password using shift, unless it's all caps.
I've not used any accents in my password and I input it exactly the same way I do to enter these forums, since it's the same account (Or at least I expect it is as I haven't received anything to say differently).
I can see on my account profile that I have successfully ordered etc, just doesn't appear to let me in (neither patcher or main app).
Should I try resetting my password and try again? I hear that while I was signing up the game server might have been in the middle of rebooting