There is a known issue with the Astea Mobile application crashing on the login screen after an uninstall/reinstall for users that are running version 3.3 of the Astea Mobile Native App on iOS Devices, this issue does NOT APPLY to Android Devices. When the users log into the mobile application we have logic that tries to communicate with the Baidu servers in China (and this currently happens whether you are configured to use Baidu Notifications or Google Notifications), if the device cannot connect to Baidu within a certain period of time an error is thrown which is not handled properly which causes the application to crash. The workaround in the meantime is to get the mobile device connected to a network (i.e. WiFi or Cellular) which allows access to Baidu services during the login/install process. There are reports that the AT&T Cellular network is randomly blocking access to certain websites in China so switching to WiFi temporarily may be required in those situations.
We have a fix for this issue that is currently undergoing QA at this time. We are targeting this for inclusion in the upcoming version 3.3.1 release of the iOS Native App, I will update this thread once it has passed QA and we can start the rollout.