Actually stuck states are why we were looking at FOP2. In FOP1, after we upgraded from Asterisk 1.2 to 1.6, the buttons we had for the parking lot would never release the button. The system functioned as it should as people were able to collected the parked calls and the parkedcalls show command always had the right information, but the FOP1 would never clear the parking lot extension.
We will try the other methods of parking a call and see what we get. Thanks for the info!