PSQLODBC and TRANSACTIONS

Hi,

I'm trying transactions using M$-access and PSQLODBC without success,
Seems that backend locks itself
by opening two connections to work on the same table.

I have a table with 3 rows:

codice nome cap
---------------------------
1 pippo 0
2 pluto 0
3 topolino 0
---------------------------

I tryed to update table as:

UPDATE operatori SET cap = 1;

This works, but the next...

UPDATE operatori SET cap = 2;

At this point the backend was locked and I had to break connection...

(See attached log file)

Thanks for any help.

-Jose'-