Something is obviously not right. Our results should be identical, but my Inception Bluray never has the screensaver kick in. Resume after stop/power off doesn't work. I tried several other Blurays, and absolutely none of them have the screensaver come on after pausing. I then tried a number of DVDs, and ALL of them had the screensaver come on. They all resumed after stopping/turning off the player.
I checked all the same Blurays that I tested above on my Pioneer BDP-320, and all of them had the screensaver come on after 1 minute. Resume worked for all of them except for Batman Begins.