Dead bird and keyboard
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Just a note that might help someone. I am running latest version of Catalina on a Macbook Air. Yesterday and today I started getting frequent dead bird screens, enough that I was about to switch back to Safari. Interspersed with dead bird screens were complete app crashes. I could not find any recent comments about crashes (I suspected the latest Chrome engine update), so I fired up Safari. It was also running slowly enough that I hated to make the change. Before giving up entirely I rebooted and found that the batteries in my keyboard (Apple BT) were dead enough to not be able to enter a password. Replaced batteries and Vivaldi sprang back to life with no dead birds.
It is possible that the reboot also played a part, but I had rebooted before with no improvement. And I don't know the connection between a dead keyboard and Vivaldi, but the evidence points to some interaction. I had been ignoring low keyboard batteries for several days, but everything is good again.
One item to add to the troubleshooting tree if you see dead birds -- check the keyboard batteries/connection.
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Also there was a Vivaldi update today
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My problem is probably different from yours, but I recently got a 100% reproducible Dead Bird. When I visited www.planetf1.com, it turned to a Dead Bird within a second. A restart of the computer didn't fix it. It happened on Guest Window, too (which means it wasn't due to extensions). There was no crash log. Strangely, it didn't happen on a separate, clean instance of Vivaldi. (See the --user-data-dir command-line option.)
It was like that for several days. But then eventually it was gone. It may or may not have been due to the latest upgrade. (I'm always on the latest snapshot.)
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You can also sometimes see "dead birds" while closing tabs / windows or the browser itself. (This is a confirmed bug: VB-63880) In this case, it is due to a rendering glitch rather than an actual crash. Internally, we've seen this under some other circumstances as well (again, not associated with a crash) but they seem to just happen and are difficult to reproduce.
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