First, can you try updating your theme files to the latest version available from your downloads on ThemeForest. There were a number of bug fixes in 1.3 and 1.4 that might be the fix for your issue.
If that doesn't work, can you create a temporary admin account for me to log in and take a look at exactly how everything is set up. I'd like to try and re-create the error to see what is causing it and if its a specific case or in the latest theme files as well.
You can send the information to my email at DevinVinson (at) gmail.com. Make sure to include a link to this topic so that my spam filter doesn't grab it :)