Yup, you are right Kevin - I remember that problem from when Crowded Backgammon was first introduced.

What it looks like a problem is in the programming - where if you are removing peices from the bar, you can not if the space has between 2 and 15 checkers.

Space #24 had 16 checkers, and the program let the other person take that position (and place one checker on the bar) (move 45)

Normal backgammon only has 15 checkers, crowded has 20 checkers..... and it is probable just a small problem that was missed while making the program - Fencer should be able to fix pretty easly. (You might want to send him a message - he does not alway have time to read the message boards.)