I've installed and setup the WP Event Ticketing plugin and all the relevant info has been added but when the form is completed and checkout button clicked on, it just returns a blank page. I've checked that the API signature info is entered correctly and can't see what might be causing this problem.
The ticket page is at:
http://bit.ly/gLJMnM
Currently in sandbox mode but have tried with live as well. Any suggestions much appreciated.