Trying again: Random(?) blank pages when using sessions

Can anyone think of ways I can troubleshoot this problem? I still haven't found a solution. > I'm using non-cookie-based sessions for authentication on a page. The > session is set like so, which works (these values, along with the SID, are > always retrievable): > > $_SESSION['user'] = $_POST['UserName']; > $_SESSION['time'] = time(); > > My problem is when I get to the protected site area, in which a header > script calls session_start() at the top (first line). Seemingly randomly, > while navigating links within this area, I get blank white pages. If I > comment out the session_start() line, it doesn't happen. If I spit out the > session variables in the resulting page, they are echoed, but that's it -- > it's a blank white page otherwise. > > The apache error log is silent, and the access log is normal. No php errors > are displayed or written to the log. Here's the real kicker -- if I refresh > the page, it loads correctly. What is going on? > > Thank you, > -- > Matt Grimm > Web Developer > The Health TV Channel, Inc. > (a non - profit organization) > 3820 Lake Otis Parkway > Anchorage, AK 99508 > 907.770.6200 ext. 686 > 907.336.6205 (fax) > E-mail: mgrimm@healthtvchannel.org > Web: www.healthtvchannel.org