Разобрался, все же.
Не "подхватываются" установленные расширения. Opera "падает" и автоматически восстанавливается на секунду-две, два раза, потом падает окончательно.
Пришлось поймать на втором восстановлении ссылку на расширения, удалить все, и заново установить.
Так и быть, оставлю пока).
Yes, The plugin suddenly stopped not only in Opera but in all devices. The app crashes suddenly and I got a news that google is upgrading the hangout so that people can take more advantage of it. The problem was from the backend side only and now the problem has been fixed by the developers it is working normally. You can also update your opera browser and install the new version. The given article will help you to understand the benefits of Google Hangout more. https://onmogul.com/stories/benefits-of-google-hangout
At home, in one of the Computers VPN works well, in mine don't, but needs a Refresh so it's not conclusive.
The router DNS are Alternate Dns if you want to try it.
Nope - Laptop is 43.xxx and is for 32 bit. Don't know why that matters. Desktop is previous version, 64 bit - Stable and should have a menu button, its just not displaying.
Some other software is running then - an email checker or similar. Opera itself doesn't do that. It doesn't even know I have a Google account (though as I also own an Android tablet I do have an account) and has never asked me for one. Or a tab is open to some page using Google services perhaps.