Ok, I found a couple of threads on agilbits.com discussing, what sounds like, the same problem. Any chance you have a local 1P vault? If you do, and the password isn’t exactly the same as the website, that could be your problem.
If you can log into 1password.com and your data is there, this is probably something simple on the mac that we are overlooking.
Check this out:
and if you still can’t find the problem, call the “pros from Dover”