using pg as a db backend in Access

Hi,

I recently posted a problem with connecting to a pg db server from access. 
Now I found that the pg/odbc driver under windows lets choose between three 
protocols, 6.x, 6.y, 6.z. I am using pg 7.x as the db server. Could this be 
the problem? I managed to get the tables linked and shown, but I cannot 
insert new data in access.

Please help,

Markus