A little problem here:
I have an account on a phpBB3 board but on login site of this board 1Password 3.6.0.BETA-37 (build 31037) don't ask to save the login after I fill the account data.
I try Safari 5.0.5 (6533.21.1) and Firefox 4.0.1
With another phpBB3 board works 1Password fine.
What's the problem?
You can use my board account for testing. Please, email me.