NMON Performance Monitor for Unix and Linux Systems: Not receiving nmon_data from TA_nmon universal forwarders

I've deployed TA-nmon to 6.3.1 universal forwarders, and am seeing nmon_collect data from those hosts, but nothing else. Was I supposed to tweak a setting in the TA-nmon config? I didn't see that listed in the instructions. The UFs I'm trying it on are running Python 2.6.9, but perl time::hires is installed.