bug in "Analyze Trajectory" of ds 2.1

Dear all,
I am a ds2.1 user. Recently, I complete one MD simulation (receptor-ligand complex). Then, I want to analyze the "intermolecular neighobrings" between receptor and ligand during the MD simulation, and this analysis is available currently in "Structure/Monitor/Intermolecular Neighobrings" option. But, it seems that this analysis could not be further applied to "Analyze Trajectory" protocol in ds2.1. However, similar setting for "Structure/Monitor/Intermolecular HBonds" could be applied to "Analyze Trajectory" protocol. Is it a bug ? Could anyone help me to solve this problem ?

Thanks for your help.