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 by GCC 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 while processing 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.