session_start() is different in .php and .cgi files

I have written a very short sessions test program and saved it in both .cgi and .php formats. I want to run my site as .cgi so that other users on the same servar can't read my files. Running as a .php file, everything seems OK. I've set the browser to prompt for cookies. And it does just that with test4.php. As a .cgi file, I never get prompted for the cookie. In subsequent accesses, the isset($_SESSION['count']) is never true. Is there an error in the way session_start() is performing header generation? My ISP uses PHP 4.3.4. I've tried putting 'Content-type...' in header() and also to place it before I call session_start(). That doesn't make my program work. The only differences between the .php and .cgi versions is that test4.cgi contains #! /usr/local/bin/php and print 'Content-type...'. The files are included below. Hope you can help me out on this one! Regards, Børge Strand test4.cgi: ------------ #! /usr/local/bin/php <?php session_start(); print 'Content-type: text/html' . "\n\n"; // Required in .cgi file print '<html><body>' . "\n"; print 'This is the test4.cgi file<br>' . "\n"; if (!isset($_SESSION['count'])) $_SESSION['count'] = 1; else $_SESSION['count']++; print 'Your visit number ' . $_SESSION['count'] . "\n"; print '</body></html>' . "\n"; ?> ------------ test4.php: ------------ <?php session_start(); print '<html><body>' . "\n"; print 'This is the test4.php file<br>' . "\n"; if (!isset($_SESSION['count'])) $_SESSION['count'] = 1; else $_SESSION['count']++; print 'Your visit number ' . $_SESSION['count'] . "\n"; print '</body></html>' . "\n"; ?> ------------