[newbie in session] Is is right behavior???

Hi, I just start in using session, but unfortunatly I meet first problem right now :-( On some PC when i load the page, the is no content, and on other PC the page is loaded properly. On computer where the page is blank i have to press F5 (refresh), and the page appear ?. The second thing I notice, is that i try display the source from browser, it doesn't work. And i find, thet when I comment or remove session_start(); the page work on every PC, and i can view the source. Could you help me? This is an example page: ( can't view the source) <?php session_start(); ?> <html> <head> <meta http-equiv="content-type" content="text/html; charset=iso-8859-2"> </head> <body> ble ble ble :-( </body> </html> With best regards, Mariusz P.S. I hope you could understand me :-))))