, while i was gone these past 6 months with the Air Force my daughter transitioned from a rear facing carseat to a front facing. my wife put it in around february and she attempted to put it in on either the left or right side and couldn't get the angle correct as well there wasn't enough foot room for Maddie's legs and feet.
so today i had to remove her carseat and fold the seats down to get a 55" TV in for a friend and when i got home i put the car seat back in. i thought id put it on of the sides to see what was the issue and i discovered that its from the headrest. the top of the carseat hits the headrest and keeps the lower part of the back from seating against the setback by over 3". the issue though is that the headrest isn't removable, so i got clever and folded the seat down, and belt the headrest back out of the locked position and installed the seat. it fit perfect.
i didn't think this was a common issue, but I've seen a couple people with carseats in the center and it had me thinking that others are coming up with similar situations. so i thought i'd throw my 2 cents and a few pictures up for those of us with tykes.