PG 7.0 vacuum problem

HI!

i rescently upgraded my system from PG6.53 to PG7.0. after a few days of
work i am unable to do a vacuum on one of tables:

nat=# VACUUM verbose analyze osoby;
NOTICE:  --Relation osoby--
NOTICE:  Pages 189: Changed 0, reaped 24, Empty 0, New 0; Tup 3436: Vac
29, Keep/VTL 0/0, Crash 0, UnUsed 180, MinLen 68, MaxLen
608; Re-using: Free/Avail. Space 67568/4196; EndEmpty/Avail. Pages
7/14. CPU 0.01s/0.95u sec.
NOTICE:  Index osoby_Imię_key: Pages 33; Tuples 3436: Deleted 0. CPU
0.00s/0.01u sec.
NOTICE:  Index osoby_pkey: Pages 12; Tuples 3436: Deleted 0. CPU
0.00s/0.01u sec.
NOTICE:  Rel osoby: Pages: 189 --> 182; Tuple(s) moved: 0. CPU 0.00s/0.00u
sec.
NOTICE:  FlushRelationBuffers(osoby, 182): block 186 is referenced
(private 0, global 3)
FATAL 1:  VACUUM (vc_repair_frag): FlushRelationBuffers returned -2
pqReadData() -- backend closed the channel unexpectedly.
    This probably means the backend terminated abnormally
    before or while processing the request.
The connection to the server was lost. Attempting reset: Succeeded.


everything other (including pg_dump) work fine


any ideas anybody?

do i risk anything if i do:

pg_dump nat> tmp
dropdb nat
createdb nat
psql nat <tmp

???

thanks in advance!

Marcin Inkielman