Invalid GET Data error

[punkby9]

I have a form set up using Form Tools v1.5.1. When users submit the form and put parentheses in any of the text fields and submit, they get a blank page that says "Invalid GET Data". The data does get submitted correctly to the database and they receive a confirmation email.

I think what's happening is when the form is submitted, the user is redirected to the thank you page, and the form data is put in the URL of the page. The parenthesis in the URL are causing the problem (I'm using Expression Engine as the CMS).

For example:
http://oprffoodpantry.org/volunteer/than...me=(megan)
vs: http://oprffoodpantry.org/volunteer/than...Name=megan

Is it possible to have the form submitted without passing the fields through the URL? Any other ideas on how to fix this?

Thanks!
Megan