It seems the good people behind the scenes at Opera have noted the issue and implemented a fix..... 1Password Extension is now working perfectly once again 
Best regards,
Kevin
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It seems the good people behind the scenes at Opera have noted the issue and implemented a fix..... 1Password Extension is now working perfectly once again 
Best regards,
Kevin
I have encountered the same issue; have just submitted the following bug report to Opera so hopefully will get addressed in the next few days....
The 1Password Extension has been working normally until (probably) Friday 11th September. It appears that a recent Opera update has ‘broken’ the 1Password functionality so when you try opening it from the extensions top bar an empty frame opens but not the actual pop-up 1Password window (see 1st .png attachment below).
I have tried the usual steps to resolve without success:
I note that there are other mentions of this issue on the Opera Forum
I have also tried installing the Google Chrome browser as a cross-check and the 1Password Extension works perfectly and as expected with that.
I’d greatly appreciate if you can check out what seems to have happened with the recent Opera update and resolve so I can get this very useful functionality back working again
Many thanks,
Best regards,
Kevin
PS.