Session confusion

I have a file called sessionvars.php that I require() as the very first thing on all my pages, it has session_register("blah"...) and about 40 or 50 variable names after that. sometimes I am seeing behavior where a form on one page that references a session variable doesn't carry over the change to the next page. in other words, i filled in a username in a form on page 1, hit submit, got to page 2 and it was remembered. but now i go back to page 1, change the value in the form, and when i get to page 2 it has the old value, not the new value! i have the following options in my apache config: php_value session.save_path "/home/phpsession/" php_value session.name "EINFO" php_value session.cookie_lifetime 2592000 php_flag register_globals on what do i have to do to get the changes to propagate through?? -jsd-