I am having a similar issue in my copy of Chrome v20
with 1Password extension. However - when my Chrome extension launches - it appears to freeze up my Chrome and I can't click into the password field to enter the master password & unlock the extension. The only thing I've found that I can do - is click the X to close the extension and then my Chrome becomes responsive again?
Windows 7 Home Premium SP1 64-bit (Version 6.1 [Build 7601: Service Pack 1])
Google Chrome 20.0.1132.57 (Official Build 145807) m OS Windows WebKit 536.11 (@122148)
1Password for Windows: v 126.96.36.1996
1Password extension: 188.8.131.52599