I'm using 1Password 3 and Firefox 3.6.10 on a Macbook Pro OS X Version 10.5.8.
I can't find my 1Password icon. I received no error messages, and I can start 1Password from applications, but it's no longer visible on my toolbar when I go to log in or fill out forms. It worked fine earlier today. I think I may have tried to upgrade to 1Password 3, only to discover that I already had it installed. This may have done something to the icon that had been there earlier.