Suddenly, as of a couple of weeks ago, I can't bookmark a page, and my custom folders, while still in the Bookmarks menu, do not display on the bookmarks page, which is now blank. I haven't changed anything with my computer. I'm running 10.6.8, and Opera version 25.0.1614.68. I suspect I can't get updates because of my elderly operating system version. Yesterday, someone in my house with a newer Mac running Mountain Lion also lost their bookmarks. Ouch.

I am having the same problem, as of a few days ago. I am running Opera 25 on OS 10.6.8. I am the admin, it's a personal laptop.