When I browse to icloud.com, and the login page is displayed, cmd-\ just pops up just the 1Password login search. This happens with both the Safari or Chrome extensions, using 1Password 4.
I have apple.com and icloud.com configured as urls for the same login. All the apple.com login pages work fine, but 1password doesn't respond to icloud.com.
If I log in to icloud manually, 1Password doesn't detect the action and offer to save a login.