Condor-Devel only runs local jobs, so it only needs the Master and
Schedd daemons running. However, even though it does not have a
collector running, it is still trying to connect to a collector on the
local machine. This results in either errors in the MasterLog if there
is no collector, or it connects to another Condor's collector. The
former is harmless, but the latter can result in problems for the second
Condor instance (the non-Condor-Devel one).
The fix is to set the Collector_Host in the condor_config file to be empty.