pg_dumpall 8.1.4 large objects error

I'm curious why this would happen:

pg_dump: dumpBlobs(): could not open large object: ERROR:  inv_open: large
object 145391 not found

The db being dumped is 7.3.2 and the pg_dumpall is from a source compiled
8.1.4.  The OS in question is Redhat 8 (soon to be upgraded).  When I used the
7.3.2 pg_dump -b, everything dumped out ok, but using the 8.1.4 pg_dumpall
which is supposed to properly handle large objects, I received this error.
Note, there's only the single error above, and I still ended up with a 17gig
bzipped file.  The 7.3.2 pg_dump yielded a 16gig file in custom format with
default compression.

I need to get a reasonable dump so I can upgrade this ancient system.  Should
I upgrade to the most recent 7.3.x version before doing the dump to have the
most reasonable chance of success?

--
Jeff Frost, Owner     <jeff@frostconsultingllc.com>
Frost Consulting, LLC     http://www.frostconsultingllc.com/
Phone: 650-780-7908    FAX: 650-649-1954