Is it really desirable behavior of pinned tabs?
I guess it depends on how you see things. Some people think that pinned tabs should remain there no matter your browser's startup settings, others may think that if the browser had been set up to start with no tabs then pinned tabs should not break it.
Some people may have different pinned tabs for each session, others may have always the same ones.
There are lots of options and it's not easy for Opera to please everyone.
Thanks for your reply! I agree with you, different people may have different opinions. But I think it is not that difficult to implement ability to configure behaviour of pinned tabs: it could be something like a checkbox in Settings menu "Save pinned tabs upon exit", and lots of people would be really happy about it! I think it is very important, because many other users, who leave other browsers and start using Opera may encounter misunderstanding, something like ("It works not like I expect it to work, it worked in different way in my previous browser, and I can not even configure that!") I really love Opera, it is one of the most comfortable browsers I've ever used, and I just want to make it even better. Thanks again for your reply!