Form POST problem with Netscape 6

Hi, I use a few forms on my websites, one of them is to log in onto the site. These sites all work well in MSIE and Netscape 3 and 4.7 BUT in Netscap 6 (6.0, 6.01 and 6.1) there is a strange effect: The result page starts loading but the loading is broken before the end of the page. The php scrips are completed (results are in the database, emails are send out etc.) and the page is generated but simply doesn't tranfer completely. For one form, the transfer always breaks at the same point, which is a fferent point for different forms. I cannot look into the transmitted source because netscape does a reload on "view source" which is not performed for dynamic pages.... Anyone seen this before? Does anyone have a qlue where to look for? (It looks to me like a header problem, but I have no idea what kind of header problem..) Thanks in advance! Peter.