Opera 41.0.2353.56 and Windows 10 Pro fully updated.

Sorry, I should have mentioned that I tried disabling all the extensions and it still didn't work.

Whenever I log into Dropbox from Opera I get the error message "there was a problem completing this request". It kind of works, but it's slow and unpredictable and I need to retry a lot to navigate my Dropbox account. I've tried Internet Explorer, Chrome, and Firefox, and neither of them have this issue. I've allowed cookies and even tried turning off the ad blocking, but nothing seems to help.