Extension pop-ups uniformly fail
Pop-ups such as OAuth2's for google, facebook etc all stall after the initial data entry i.e. will not process OAuth response (cascading pop-ups) Similarly extension pop-ups for most apps also fail to respond (e.g. LastPass) where you have to use the vault in a normal window to do anything that requires interactive pop-ups Initially annoying but actually a real productivity killer, making Vivaldi not yet ready as a production browser for actual usage I am currently using the 64 bit latest snapshot (it does this on all versions I have seen through the development cycle), on an i7 running Windows7Prox64 with all service packs and updates
Yes, i doscovered some OAuth problems on wensites.
But please report one of your issue to be reproducable as testcase and describe it completely for bugreport at https://vivaldi.com/bugreport/