Last night or, early the following morning MST, the error was that was breaking the browser on 4.4.4 was addressed first seen in the beta version then, the standard channel release version. Many thanks to the Opera team and commentators of the forum that replied to this post.
@samseb Not only you, some of other people also experience it. Anyway do you tried to clean install the opera mini? Maybe it fix the problem, on the other thing, opening private tabs not working for now, I don't know why, it just crash after changging to private tabs on anrdoid pie
@pedro78 Check on 'about Opera' to make sure you have the latest stable version 53.0.2907.99. Update if not. This was my problem.
Else, download another browser eg Firefox and use it for logging in to online banking.