well you can send me info through the contact info hard to say without more info.
Classifieds has been out for awhile and i have it running on two sites of my own.
have you tried running the 4.x and 5.x upgrades
white page sounds like a corrupt file or wrong paths to vb
in the config-int.php file if you replaced it.
if you can turn on display errors in php it helps see what the error is. Your server error logs as well should have an error and that would help me help you.