pg_clog woes with 7.3.2

Hi All,

Just building a new box with Slackware Linux 9 (2.4.20 kernel) and
PostgreSQL 7.3.2 and I've run into a little problem. I've successfully
loaded about 260Mb of data from the old server (7.3.1), however when I
vacuum one of the databases that I've loaded, I get the following error
(which Google would have me believe was fixed in 7.2.3):

mnogo_int=# select version();                                                                          version
                       
------------------------------------------------------------------------PostgreSQL 7.3.2 on i686-pc-linux-gnu, compiled
byGCC gcc (GCC) 3.2.2  
(1 row)
                       
mnogo_int=# vacuum;
PANIC:  open of /disk1/data/pg_clog/0001 failed: No such file or
directory
server closed the connection unexpectedly       This probably means the server terminated abnormally       before or
whileprocessing the request. 
The connection to the server was lost. Attempting reset: Failed.
!#


There is only one file in pg_clog - 0000. The directory is owned by the
postgres user, and is mode 700.

Any ideas would be appreciated - I'm not too worried about losing data
either as the old server ain't gonna die just yet.

Regards, Dave.