I am using android 6.1 device. My customized Moodle mobile app in debug mode is working nicely but the same app is not working in signed release mode. To configure the problem, I also checked Moodle Mobile official app downloading from the Google Play store. Same problem exist - app does not load even the log in page. In addition, I tried the app in windows device, it working nicely. It means, the problem is in signed and released android app. Please help to solve this problem.