When MapPress Pro is active, update notifications to WPtouch Pro plugin are suppressed, so I’m never notified of updates to the plugin. When MapPress is deactivated, the update notification is back again.
I can’t imagine what WPtouch is doing that MapPress could possibly interfere. Have you tried contacting them?
I don’t have that plugin to test with, but if you’d like to email me, perhaps we can find a way to share your copy or I can try to debug it on your system. However, since I’m not familiar with their code I’m not sure it will be helpful.