I have not seen specifics that have rounded the web on HP “Chamber Of S”, except for an issue with playing extras on Macs. There is some sort of encoding on HP COS the Macs don’t like.
The HP “Sorcerers Stone” disc did have issues in some peoples AV setups traced back to finally a studio release of some discs with one version of Copy Protection and other discs without it (or just a different version as according to the studio all discs WERE protected one way or the other).

Could be we have two version of encoding (again) being tested by the studio on COS also which could cause one system to glitch with one version of the encoding while that same version of encoding does not bother another system. ( and the two versions of disc on market as was SS can confuse the issue more).

Here’s an issue which can get you a repeat error performance out of a rental disc depending on player.

“The DVD-RV32 performs quite nicely. Additionally, the disc stabilizer system is supposed to make slightly warped discs easier to read. This feature should come in handy if you rent a lot of DVDs, as rental discs can be badly handled. Even discs with rental clamping area stickers (i.e., bar code stickers) are mostly playable (see picture). Sometimes these stickers causes some DVD players to lose grip of the disc, resulting in difficulty with play back (dropouts) and even loss of play back capability. Other times, the stickers can be applied unevenly, throwing the disc's balance off. The DVD-RV32's disc stabilizer feature handles these cases with little difficulty. It certainly does much better than my aging Sony DVP-S7700 DVD player. Kudos to Panasonic”
Excerpt from following
http://timefordvd.com/hardware/review/Panasonic_DVD-RV32.shtml


And here’s a helpful list of current players with reports of problems (dropout’s etc) experienced by some owners with discs in general:

http://www.dvdfile.com/software/glitch_gallery/hardware.htm

Not impossible but I would not worry too quickly about Outlaws 950/1050 not handling any disc even with a couple of reports…this stuff takes a bit to iron out, and I see it again and again (usually traced to something else).