@mark for one reason or another, it doesn’t really matter, we get used to continuous problems. But it’s Christmas and I want to keep a good mood.
Here’s an example from a week ago, a book disappeared and the answer was because the audio got broken (probably from another update): https://forum.lingq.com/t/albert-camuss-the-stranger-l%C2%B4%C3%A9tranger-in-french-disappeared/154383
I definitely don’t remember the books, but it happened to me at least 3 times, two times with other French books.
The problem is that, for whatever reason, if I cannot be sure a content will be removed or not before starting, I don’t even bother to start it anymore.