Help! Getting blank page after sending email through sendmessage.php

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I could use a bit of help here.

I'm working on a new forum (3.5) and have been doing quite a bit of customization with the templates. Everything is going fine except that when I try to send email through contact us or email this page I get a blank white page after hitting "submit" with all the variables in the url. They aren't being passed.

I've tried the diagnotic tool and it works and I have another vb 3.5 board on the same server so I know that isn't the issue either.

Basically I've figured out that it has to be in the templates I've modified.

Question:
Which templates can have an impact on how email would be submitted?

Here are the templates I've edited:
footer
Forum Display
Forum Home
all the forum bits
forumjump
header
headinclude
navbar
postbit
search_forums
ShowThread
threadbit

Any help is much appreciated. Thanks!