Installed VBPlaza, now replies don't work on the forum

I've installed VBPlaza and made all the template mods. The system "appears" to be working as I can see the points increase and display with my users.

However, when someone posts a "quick reply" an error gets received by the user and I've attached a screenshot of it. If the user hits "OKAY" they are returned to the quick reply box, but the post DID go to the forum.

Also, when a person uses the regular "non quick reply" reply button, upon making a post they get the blank white screen in their browser. Once again, the post DID go to the right forum.

I've re-uploaded the newreply.php and showthread.php files to no avail.

Please help...?