TonyTiger - What all did you replace? Just the plastic clip in the rear that looks a little like a lazy "C"? The 1x2 (resting on the floor) behind the clip certainly sounds like a good idea.
It is amazing that we all experience the same type of nuisance issues. Our 211S also has a sticking bottom drawer. Ours is below the microwave. We have not had ours long enough for me to get down on my belly and study what is catching. Minor shimming should fix the problem. There has to be a catch of some sort to keep the drawer from sliding out while traveling. Suspect it is hard to make the catch just right.
Let us know what you find on your drawer.
Gene
2002 B Plus 211S w/5.7 Chevy