Very odd. I wonder if it has something to do with how the sensor bar picks up the movement.
Here's a photo of my sensor bar about my center channel. The two purple looking things above my center channel are the sensor bar.
I haven't had a problem with light yet and our main room gets filled with some pretty intense light. I will try it out next time I'm home during the day to see if it affects the remotes.
I wonder if you can shield the sensor bar from direct light from above and have it work?