Many of us reported problems with HipChat today / recently.
It seems Atlassian has merged accounts of HipChat and various other
services, like our
JIRA.
I would suggest to reset your password and consider that your new
password will apply to all (most?) of your Atlassian accounts:
I'm not sure what they did exactly, but after resetting my password on
JIRA a couple of days back, now to login on HipChat I had to use that
same password.
HTH