This post is partly for the benefit of any friends experiencing the problem and partly to get the specific error message text out there on Google.
Every since a recent update, the Mac Mini hooked to the TV stopped playing shared video files from other machines (movies, video podcasts, music videos, etc.) Audio files still play just fine. It is just the video files that are broken and return the following error message: “This shared video cannot be played. The shared video server may be having problems playing this video.”
After a bunch of failed Googling and hair-pulling, I finally managed to find a thread on the Apple support forums of countless others having the same problem. The solution? Kill off iTunes 7.2 on the FrontRow machine, then install the older 7.1.1. You can still leave the update on the machines serving up the videos, just not on the client that is running FrontRow.
With something as obvious as “the new iTunes doesn’t play videos under FrontRow,” you kind of have to wonder what kind of QA occurs before iTunes gets released.