Unfortunately, Disney is somewhat notorious for doing all sorts of nefarious things with their DVD Authoring to break playback on PC players. Here's a long-standing thread on the VideoLAN forums about just this thing:
http://forum.videolan.org/viewtopic.php?f=2&t=85150They intentionally make it so that Windows Media Player (which they "trust") is able to play them properly, but other 3rd Party players (small guys, who don't cough up tons of loot or work out "business deals" with them) are shut out.
You could try MC18, as MC17 is no longer being developed. But, if it doesn't work there, the best solutions for MC17 are:
1. Try a different DVD-Rom drive. Different players actually react differently (and give MC and its decoders itself different results) to the mucked up tables of contents and other crap they infect the discs with to intentionally break playback. Newer drives often handle the errors better.
2. Return them. It is bogus that they are selling intentionally broken, non-standards-compliant discs. It is a joke, doesn't stop piracy, and irritates consumers. They claim it is "DRM" to stop piracy, but it is really about something else entirely. They won't stop, though, unless people stop buying them.
3. Get an on-the-fly decryption system like AnyDVD.
4. Rip them to your hard drive.
I think you'll find that most of the power users here just use AnyDVD (or something like it) anyway, which is why (other than that development on MC17 is closed) you're not getting much feedback on this. That's the best and easiest way to support BluRay playback on PCs, and it solves the problems with DVDs too. As the companies add additional idiocy to their latest pressings of discs, the SlySoft folks figure it out and work around it.
For MC18, which is still actively being developed, I'd post a bug report, and others can try to replicate it (or maybe they can look at the logs or something).