Hello,
Skype from Flatpak on Fedora 38 is hanging with a white blank window after trying to log in. Quitting Skype from the tray icon still works, but it asks you to log in again when restarted.
It happened once when I updated to Fedora 38 over a week ago, but after a login it worked; today the Skype from Flatpak got updated and no longer works.
I now installed Skype using RPM instead and it works, so it seems to be a Flatpak-Skype specific issue.