Got could not truncate directory "pg_multixact/offsets": apparent wraparound

Hello,  running 8.4 on Centos.  Been running production for 6 months.  Never
saw this message until tonight:

  LOG: could not truncate directory "pg_multixact/offsets": apparent
wraparound

In case it helps...

Output of pg_controldata:
Latest checkpoint's NextMultiXactId:  145725622
Latest checkpoint's NextMultiOffset:  394849408

Contents of pg_multixact/offsets:  08B0
Contents of pg_multixact/members: 178B

In conf file:
vacuum_freeze_min_age = 1000000000  # (1 billion)
autovacuum_freeze_max_age = 1500000000  # (1.5 billion)

Oldest txn in cluster (pg_database.datfrozenxid) : 648

Should I be concerned?

Thanks
Gordon


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