Hi Markbluk,
welcome to Questions & Answers..
As you may have already read on similar problem's like this in the past Sony have suggested that you install the latest firmware, which you have done, & also do a factory reset..
If you still have the disc could you try a factory reset of your S480 please, then if the The fringe disk's still does not play could you supply as much details as you can from the DVD/BD disk please, type of disc BD or DVD (retail or rental), region code, releasing studio, version, etc. so that I can pass it onto Sony in the hope that they can find a solution..