Comment added after this thread having been read for 40+ people: the main reason why I post this question here, after asking for help in the Vivaldi community forum, is the doubt about the issue being a possible problem with some library or something else in my Debian. Further, people who are familiar with chromium or other browsers based on it, may have information that can be hard to find, or take time to be found, in the Vivaldi forum.
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Hello,

I do not like most of the new browsers I know, and how they deal with some pages, but Vivaldi has been a pretty good one since a lot of months. But today, it stopped starting for me, with my user config and saved session.

First, it let me choose the profile to open. It was shown just with the saved tab lists, but no content shown. Just an empty page with Vivaldi logo. After that, I updated the browser from version 5.2 to 5.4, and now it exits a few seconds after showing profile choice window, when it starts. Running it from a terminal, there is some error output.

A much more detailed text and discussion about this is on a thread i made in the Vivaldi forum:

forum.vivaldi.net/topic/79513/urgent-vivaldi-5-4-is-not-starting

No solution until now, though.

How did you install vivaldi? With your package manager, so that all libraries match?
From your distros repo?

Or did you install something outside of your distros repo? A random binary, or did you build it from source against the libraries that you have on your machine?

You get the point. Does 5.4 match the rest of your machine?

Edit:
Vivaldi latest source
https://github.com/archlinux/svntogi...trunk/PKGBUILD

using Opera seem better esp. on bleeding edge update OS i.e. rolling update, e.g Arch with special addition of repo to have latest codec H624

I run Debian 11. I recently updated Vivaldi to version 5.4.2753.51.1 using synaptic and I have had no problems. If you have not introduced any non Debian packages into your system then I suggest that you take a look at your Vivaldi settings to see if you have some inconsistency among the options that you have selected.

The problem did not start with Vivaldi 5.4. I had a working Vivaldi 5.2, which was installed with a package specific for Debian, downloaded from the Vivaldi website - as I have been doing since I started using it. I installed it with 'dpkg', and I think this makes eventual dependencies get installed from Debian repository. After a computer crash, it stopped working, with the changes over time described in the other thread.

I updated Vivaldi to 5.4, using 'dpkg' too, to see if something would change. It did not.

Vivaldi is not open source, as far as I know.

This is not "Vivaldi lastest source". You confused me with this statement. And now, i checked the github page, and it does not seem to do nothing special. It gets a stable RPM version (which should be meaninful to Arch Linux as DEB is for Debian and its derivatives) from the site, installs it in the system, without changing or checking any library that would not be done so with a simpler "download from Vivaldi site and use the system package manager to install it" method. Is this idea wrong?

The thread is till active, but why cannot i change its title anymore? The "(EDITED!!!)" Written there should be temporary only. It is a bad aspect to keep with the thread now, and in the future, when it finishes.