yet another upgrade question

I'm upgrading to PHP4.2.2 on a box with apache 1.3.26 and have now been bashing my head against the wall for a couple of hours, intermixed with a couple periods of restfulness. I am experiencing a couple of problems 1) I.E. is hiccuping on some of the pages giving an HTTP 500 error on random pages, not all of them just about approximately 25% of them. With little rhyme or reason that I have been able to find so far. Other browsers, like Opera and NS have no issues with the pages. 2) Session variables are not being preserved. I put in a new php.ini file after backing up previous and retailored the bare minimums of it to my site. I reverted to previous php.ini file and it works, everything is the same in the section that deals with session variables Thanks, Jeff V