I am getting this error message almost continuously now. Sometime it comes and yet 1P correctly opens the site. Sometimes it comes and all I have to do is click the icon and click the web site again which shows at the top of the jump list. Sometimes it appears after I have entered the site. Sometime it appears on a blank screen as in the screen shot attached.
In addition, quite frequently, 1P fills in the log-in details and leaves me on the log-in screen and I have to click "Enter" or "Log-In" to complete the process.
All this is after a recent clean install.
1Password Version: 4.6.0 Beta 605
Extension Version: Not Provided
OS Version: W10
Sync Type: Dropbox