Safari was working fine with extension 3.9.20, suddenly "Problem with Database".
I'm still running version 3.8.17 and it has been fine for months now with Yosemite, years with Lion. The application itself still seems to work. But in Safari, the gray area that says "Enter Master Password..." becomes Red/Maroon with the message "Problem with Database." It goes on to say "Extension database not available. Please press Command-Option-Q to restart your browser and discard [it's cut off there]. So I don't know what file to discard, and whether it's even possible to discard stuff with Yosemite anymore. I did a minor upgrade to Coda 2.5.15 tonight and I suppose it might have corrupted a file that Safari and Coda and 1 Password share.
1Password Version: 3.8.17
Extension Version: 3.9.20
OS Version: OSX 10.10.5
Sync Type: no iCloud