"LockRelease: locktable lookup failed, no lock"

Searching through the archives, I see a few other persons having this
problem, but no solutions, so I'll ask again. : )

I'm getting "LockRelease: locktable lookup failed, no lock" trying to
insert a row into a database. The database is very simple, it contains a
single table with 8 fields. Over the last few weeks, the database has
been corrupted regularly, but a "vacuum analyze" would do the trick. I
decided to see if I couldn't fix the real problem, though, so I destroyed
the database, created it again, and tried to insert data - but I keep
getting "LockRelease: locktable lookup failed, no lock" when trying to
insert records.

If anyone has suggestions on what to do to fix this problem, please let
me know.

steve