Glad I could help
There may be a problem with the network in your area or your Q.
Since you specifically mentioned House, I went in to see if it would play - I'm watching the update from 12/4 right now. The update from 12/11 plays too.
In answer to your question about the plans...There is nothing that would physically prevent you from switching to a MediaNet plan. However, according to the terms of service, the MediaNet plans are not supposed to be used on PDAs (which at&t considers the Q to be one). I've seen posts where people have done so, but I've also seen posts where people have received HUGE data bills when the line is audited (apparently the IMEI or some other information that identifies what type of phone you have is reported when you use the network). For me, it seems safer to use the PDA plan.
Happy Holidays to you too!