ezSQL is not running with postgresql, php5

I´ve developed a system using ezSQL 1.26, PHP4 and Mysql. Everything was OK.
Now I need to use PHP5, PostgreSQL. I´ve changed to ezsql for postgresql and changed database, password...
When I call any php script, no error is reported. Only blank page. I´ve tested some small scripts with only connection/small query and they only result blank page.
I´ve spent many hours trying to solve this problem and I´m feeling weak. Could someone give me some help? Thanks.