I experienced the white page and error on front page like before. I have used this plugin before, it used to be a great plugin. Its creates two AWPCP pages and makes one as parent to all the pages you have. I had a similar problem last time where it took me a full day to rebuild the website cause I had not made proper backs. Today, I made sure I backed up, for AWPCP, backing up the DB is sufficient. if your site does not work after install of this ONCE VERY NICE plugin, just restore the database via cpanel after disabling the plugin through the phpmyadmin. I wish they could resolve these issues. I have Buddypress, askimet, contact form 7, captcha, business directory plugin, really simple fb share, activity monitor, welcome pack, external links, jquery lightbox. I have used these plugins with AWPCP before without a problem.
http://wordpress.org/extend/plugins/another-wordpress-classifieds-plugin/
