Walkthroughs for custom maps.

Xaart, hello! Are you using the HD mod? The issue of the game freezing has been resolved there (well, except for some very specific cases). At least, I haven't experienced it in recent years, except for one or two crashes, but regular saves help to replay and continue.
If you have saves before the freezes, try loading them in the HD mod or send them to us here. And we'll also take a look at the save before the error in "Seven Seals." Maybe we can overcome these problems.

I took the Berserk scroll and put it in an active slot, specifically to check - it still didn't appear in the spellbook! I can't understand what the problem is.

- I can't imagine either, it shouldn't be like that. And which version are you playing? Maybe you have some hero mod or modified game resource files (txt)? Send that save too. By the way, "Lord of the Rings 3.0" includes additional files: images and def files with descriptions of artifacts (but some people wrote that you can play without them).