We'd need a url to see what's may be happening in your installation. If you like, you can email your support question to info at bravenewcode.com.
You may be experiencing a plugin conflict. To isolate which plugin(s) may be contributing to the trouble, deactivate all except WPtouch from within the WordPress Plugins area, clear your browser cache and local data, then test.
If WPtouch functions well, you may then enable the rest of your plugins one at a time, repeating the process, until you can identify which is/are causing the problem.