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Still happening with MKV version 1.18.2 so the "mastering errors" fix didn't help with this particular problem. Below is some more information. I noticed that the error messages are almost exaclty the same but not quite so perhaps the difference could be helpful. Are certain drives better ...

So it looks like you've confirmed this is a problem with MakeMKV Backup, which is what we're claiming. I don't think you've shown it has anything to do with disc menus but that's irrelevant to the end user anyway. The problem is MakeMKV Backup fails with some (too many) DVD titles. I have at least 7...

Same digits (121266097) in the debug stuff someplace for those as well? I should also note that I get the same failure on multiple copies of the same movie (i.e., I tried another DVD of the same move and got the same error). So it certainly seems to be a problem with MakeMKV not being able to deal w...

Two more examples: Mr. Woodcock (2007) yields DEBUG: Code 0 at B`ut4y]!X\p5gw'4V:jX:121266097. Captain America - The First Avenger (2011) yields DEBUG: Code 0 at #5Q.cQ`>r,#pAMVd=%ky:121266097. So maybe the 121266097 really doesn't mean anything but it sure would be nice to figure out why these 5 DV...

It must be a bug. I see the exact same failure with multiple discs on different computers, different drives, and different versions of MakeMKV. The digits after the ":" are identical "121266097". This is what I get for Spider-Man: DEBUG: Code 0 at r79-F\`Qopn&7y,}?R%):1212660...

I believe I'm also seeing a problem related to RipGuard. In my case, RipGuard seems to be preventing MakeMKV from making a Backup from DVD. It gets very near the end (within a few hundred kB of the total claimed, which is about double what it should be) after MANY RipGuard notices before failing. I ...