I'm using 1Password Version 3.8.21 (build 32009), syncing with Dropbox, on my Macbook Pro, running OSX 10.9.1, with Safari Version 7.0.1 (9537.73.11). Have been using it for a very long time, without any significant issues, other than a recent sync conflict snafu that seemed not to cause any permanent damage.
Earlier this morning, I removed an extension from my Safari config. The extension I removed was something unrelated to 1Password-- I didn't do anything to the 1Password extension (which is version 3.9.20). But immediately after removing the other unrelated extension, 1Password stopped working in Safari. When I try to unlock the database, I get an error message: "Extension database not available. Please press Command-Option-Q to restart your browser and discard invalid..." (I can't actually see the rest of the error message text-- it is truncated because it won't fit in the dialog box. That's a little frustrating...)
I followed those directions, pressing Command-Option-Q. That didn't help.
I "reset" Safari completely. That didn't help.
I completely uninstalled the extension, "reset" Safari, and then pressed Command-Option-Q. Then I re-installed the extension by downloading it from the page that is brought up by the 1Password app, "Install Browser Extensions" menu option. That didn't help.
I completely uninstalled the extension again, reset Safari, then rebooted my Mac. Twice. Then I re-installed the extension. That didn't help.
Meanwhile, the 1Password application works fine, has no problems opening my database, and doesn't give any errors at all, and I can see all my password records without any obvious problems.
What am I doing wrong???? How can I fix this? I use 1Password every day-- if not every hour I'm on my laptop. This is debilitating! Please help!