For the last month or so, there have been reports that Sony's more recent DVD releases will not play on some DVD players, including one of their own models, the DVP-CX995V. According to Video Business, Sony has come clean about the problem, stating that it was caused by an update to their ARccOS copy protection scheme. While Sony claims that they've received a very small number of complaints, they are offering replacement discs to those that are affected.
Sony said the problem was due to an update of its ARccOS copy-protection system, an additional layer of protection meant to prevent ripping. The studio has included ArccOS on its DVDs for the past two years. The copy-protection is continually updated to keep ahead of hackers.

"Recently, an update that was installed on approximately 20 titles was found to cause an incompatibility issue with a very small number of DVD players (Sony has received complaints on less than one thousandth of one percent of affected discs shipped)," the company said in a statement. "Since then, the ARccOS system has once again been updated, and there are no longer any playability problems."
While I'm sure this will give Sony haters one more reason to go off, you have to give the company credit for making things right. It's too bad they didn't do the same with the whole rootkit debacle. If you'd like to read more, the entire article can be found here.