I encountered something similar when analyzing OMSSA results.  I see
the "NAN probability density detected" message whether or not the
ACCMASS and/or NONPARAM options are enabled (and my decoy tags start
with REV).  Nevertheless, probabilities are computed for all the
peptides and the Prophet models look pretty reasonable.  Is using the
computed PeptideProphet probabilities despite this error a bad idea?
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