@jcnw If you're still having this problem, I have a likely solution. I had the exact same problem for the past week with Opera and PNC bank. What was odd is I could log in with Opera from my desktop, but not from my laptop. After some chats with PNC that didn't help, recalled a video I watched on YouTube several days ago that was recommending everyone should have Revo Uninstaller on their computer. I used it before but forgot about it.
What Rove does is fully removes/deletes programs from your computer as well as any junk left behind in the Registry and other places. I ran Revo and fully deleted Opera, then reinstalled it and problem solved! I an now log in to my bank without problems. BTW the program is free.