I see. It seems like the easiest way to fix it for the time being is just to edit the titles of files that have a # in their name. It seems that it might have a similar issue with several other symbols as well, as I also got errors when trying to open files that had said other symbols.

Thank you for that information.

For some reason, whenever I try to open an mhtml file with Opera, I get a "Your file was not found" error. Opening the file in Chrome or Firefox, on the other hand, works perfectly every time. Does anyone know what could cause such an error, and how to fix it?

EDIT: It turns out that the file had a # sign in its title. For some reason, that doesn't cause any problems when opening it with Chrome or Firefox, but it makes Opera give the "Your file was not found" error message when attempting to open it. Renaming the file allowed Opera to open it.

Is this normal for Opera, or some sort of problem?

Well, the problem is back with a vengeance. Today, I lost over half of my tabs after closing and reopening Opera. Fortunately, I had saved them as a Speed Dial folder first.

I tried what you recommended, then copied over some of the old files that contained essential data (bookmarks, Speed Dial, extensions, cookies, etc) to the new profile. I tried to keep the amount of files I copied over to a minimum, to hopefully prevent copying any corrupted ones. So far, the problem seems to have been corrected. I'll keep checking. If the problem seems to appear again, I'll report back.

Thank you for the suggestion.

But if I do that, won't I lose all of my data (bookmarks, Speed Dial, etc).

I'm using Opera 35 on Windows 7.

For the last few weeks, I've encountered a new problem. I don't know if it started with an Opera update, or with something else (Opera updates automatically, so I don't always realize when it's updated itself). Almost every time I exit Opera and start it back up later, some of the tabs that I had left open when I exited Opera are gone. Sometimes it's about 3 of them, sometimes closer to 10. The missing tabs weren't in a straight row or anything like that. They're just random tabs (say, tabs 5, 8, 13, 14, and 27, for instance). I don't know if this is a bug, or some new feature of opera that closes random tabs to save RAM memory. Either way, I want it to stop. My temporary solution is to save all tabs as a Speed Dial folder every time I close Opera, then go through all of my tabs and the bookmarks in the folder, manually opening all of the tabs that Opera "forgot" to open back up. The weird thing is that if Opera closes unexpectedly due to the electricity going out or crashes for some reason, it usually comes back with all of the tabs. It generally only "loses" tabs when it closes properly.

Does anyone have any idea what could be causing this or how to fix it?

I would like an extension for Opera 15+ that simulates the View Bar from Opera 12 (with a search in page field on the left and options to zoom the page being viewed in or out 50%, 100% 150%, etc on the right), that can be set to appear on the bottom of the browser window instead of the top.