Modal Dialog plugin with WPtouch

It sounds as if there’s a conflict between the two plugins. The free version of WPtouch hasn’t a method to handle conflicts so we can only recommend that a suitable replacement be found for Modal Dialog if possible.

WPtouch Pro offers a few ways to work with conflicting plugins. In addition, if it’s simply a matter of styling, WPtouch Pro allows for custom CSS to be added to your mobile theme that may adjust the plugin’s display. If you do chose to investigate WPtouch Pro, there’s a 7-day trial period during which you may request a full refund for any reason.