Due to a bug in the latest Android update, certain mobile devices experience problems opening some applications. If this happens to you with the UMHApp, as a temporary solution you could try uninstalling the Android WebView application temporarily.

Steps to follow:

1. Open the «Settings» on your mobile device
2. Go to the «Applications» / «Manage applications» section.
3. Once inside, you need to search for the «System Webview» app or similar.
4. Tap on «Uninstall updates».
5. Restart your phone or tablet