some cable boxes when you flip the outputs to HD (i.e. set output to 1080i), it will cause the OSD to only appear on the HD ports.. the Motorola DCT6200 works this way...
I honestly don't care..because it allows me to seamlessly use both the LinuxMCE UI, and the LiveTV (type 11) UI, and I have my TV connected to both the tuner and the direct path, so it's transparent for me anyway, if I want to move between HD and SD content...
-Thom