I have 1password 18.104.22.168 installed on my Windows XP machine running Chrome 12.0.742.112
I haven't updated anything for a while. The Chrome plugin has been working fine, but today it tells me the master password is incorrect. I can launch the desktop client and the master password works fine. I have stopped/restarted chrome, made sure my caps lock is not on, etc. etc. I know I am entering the correct password in the chrome plugin.
I am also using DropBox for synching the 1password files, but like I said, the desktop client works fine.