Wow...if that's the solution...I'll have to try it! I didn't even know there was a VIDEO out option selection, but this would make sense as I use the VIDEO button when the remote is in "TV" mode and have occasionally seen my RF/COAX out go dead while the S-Video continues to function.Try hitting the video button on the Dish remote control.
Now there is still the bug I get regularly that causes the entire unit to slow down dramatically, forcing a reboot. (responds to commands 30 seconds or more after each remote button press...so its not a low battery thing, the 501 is caught in a loop or memory leak somewhere).
Is there by any chance a "Slow Menu" button I'm hitting by mistake?