The latest version of the 1Password Chrome extension (22.214.171.124) no longer fills in logins if the window is "popup" style (with no address bar and tabs).
The problem is not with the hotkey. If I have a login page in a popup window and hit Cmd-\, it will pop up the 1Password Mini window, let me enter my password, and show me a list of my logins for that site. But when I select the one I want, it simply doesn't fill in the login fields. Basically, it works exactly as it would in a normal window--except for the very last step when the filling-in should happen.
The easiest way to see the bug in action is to use an extension like this one:
That extension will convert any tab into its own popup window. Navigate to any login page, try filling it when it's a normal tab, then convert the tab to a popup window and try it again to see the bug.
But just to be clear, it's nothing to do with that extension. I've seen this behavior in other popup windows when that extension is not installed. It seems to be purely an issue with popup windows in Chrome.
I still had an old version (126.96.36.199) in Chrome on a different computer and can confirm that version worked perfectly with popup windows, so it appears something has changed between that version and the current one.
Chrome 43.0.2357.134 (64-bit)
1Password 5.3.2 (532001)
1Password extension for Chrome 188.8.131.52
MacBook Air 13" mid-2012
Thanks! Please let me know if you need any further detail on this.
1Password Version: 5.3.2 (532001)
Extension Version: 184.108.40.206
OS Version: OS X 10.10.4
Sync Type: Not Provided