I'm back with more information. I did a complete reinstall of the OS and MediaPortal, and now my card is detected. But I'm having no luck getting a video stream out of it. After several hours of futzing, may I share some logs with you? Thanks!
-Henry
P.S. Sorry about the smileys below...
-Henry
P.S. Sorry about the smileys below...
[edit: Deleted inappropriate log quote.]