Cannot add an column of type serial or bigserial

Dear Pgadmin Folks,

I am using pgadminIII 1.0.2 with PostgreSQL 7.4 under W2K SP4 and Cygwin 
(current as of 2 or 3 weeks ago).  The server is running locally.

If I attempt to add an column of type serial or bigserial to a table, the 
operation fails with a message telling me that adding an column with a 
default value is not implemented.  What is really weird is that one can, in 
fact, add a column with a default value, like an int4 with a default value 
or 0.  The problem does not arise if the serial (or bigserial) column is 
created when the table is created (as a part of CREATE TABLE).

Yours,
David

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Dr. David E. Sigeti
Phone: 505-667-9239
E-mail: sigeti@lanl.gov
Surface mail: X-8, MS-F645, Los Alamos National Laboratory,              Los Alamos, NM 87545 USA