I upgraded to php 5.2.9 and can no longer login to WordPress; after entering my user name and password and clicking Login, I get only a blank page (this is with all plugins deactivated). When I switch back to php 4.4.9 (the only other version available to me on my host, Westhost), I regain login access. However, I need php 5.2.9 for another program (phplist) to work properly. Anyone else having problems with this? By the way, I'm using WP 2.7.1.