Thanks for the confirmation. The problem is that my (cheap) switch tries to autoswitch when it sees a new input come live. Because the HDMI signal on the DVR is always live, it doesn't always autoswitch when a new signal such as the DVD comes on second. It seems to be happier when only one input is really live at a time...
I don't know how much your willing to spend, but this switch has worked flawlessly for me and has dropped in price (by $25) since I purchased it a month ago:
4 port HDMI switch with Optical Audio routing. Version 1.3. 4x1 HDMI switcher for integration with HDTV and audio receiver
This unit will auto switch with the sat receiver on or in the "off" mode. I have a PS3 hooked into it along with sat receiver. Also has auto optic cable switching, which I needed as my tuner has only one input too. I had an Extreme Mac switcher before, but it didn't auto switch. Had to use tiny remote, when I could find where my cat had last swatted it if I didn't put it back into the drawer!
And didn't have the optic cable switching capability.
I know that the cost may seem a bit high, but having only one HDMI input on the HDtv, and only one optic input on tuner, this seemed a logical choice for me then having to replace either of those. I also have room to grow with the additional 2 input/outputs.