My work requires me to keep track of many pages, so I usually have dozens of tabs open in a session, organized in different folders. Today in the morning, I had a window with about 100 tabs when I decided to grab one of these folders and work in a different window. So I closed the window with 100 tabs and worked on the one with about a dozen.

After I finished, I closed those dozen tabs, but when I reopened Opera, my session with 100 tabs was gone. That happened in the past, and I quickly recovered them in the search history. But this time, there was nothing there. There was actually no history of my activity before 1 PM.

I tried a few suggestions I saw online, but nothing is working. Should I just give up? I don't understand why it did not register anything in the history.