I can't log in with my owner account either. Not sure when it happened, sometime within the last 24 hours. It keep saying "incorrect password".

I have another account (as a miner) that gives me a different error message when I try to login:

This login has owner or active permissions. This is disabled until a future anouncement.

I'm going to assume it has something to do with the security updates they're doing on the site. Since I'm getting an error message on that 2nd account, I think an announcement is incoming about it (and the security changes).