What is that that make you think so ?
I created backup using by clicking on gnumed v 17 database and then by using backup option provided by pgadmin 3. It returned the value 0 suggesting that the backup has occurred properly.
Then I clicked restore button on gnumed v17. I expected it to be smooth as the database structure, version is the same.
But it returned errors. I am attaching error log. As suggested by you, I tried to set read only option to off by inserting set_default_transaction to off , but no avail.
I tried this on windows vista on another machine. It returned same errors.
I think I made it clear now.
Vaibhav