Vivaldi and I assume other Chromium based browsers do not recommend downgrading between significant versions. So 7.2 -> 7.1 is a no no, it can break the browsers profile for your user.
vivaldi-stable is updated to 7.3.3635.4 for this weeks sync. brave, opera-stable and vivaldi-snapshot also have new versions this sync. Hopefully it fixes your issues.
If not you can try deleting the browsers profile/cache.
WARNING: deleting these folders will delete all browsers settings, bookmarks, history / cache, saved passwords, extensions, extension settings etc so backup if that data is important to you.
For vivaldi-stable:
~/.config/vivaldi/
~/.cache/vivaldi/
For vivaldi-snapshot:
~/.config/vivaldi-snapshot/
~/.cache/vivaldi-snapshot/
For Brave:
~/.config/BraveSoftware/
~/.cache/BraveSoftware/
For opera-stable:
~/.config/opera/
~/.cache/opera/
