Problem with message list display

Hi I have the pro version installed on my site and everything is working great with one exception. When I click on the MESSAGES button the page is just blank. I’ve tried deactivating my plugins etc, can you think of a reason why this might be happening? I’ll happily shoot you some login details if you want to poke around in WP.

Cheers,

Fraser

https://www.ads-software.com/plugins/cp-contact-form-with-paypal/