When upgrading certain Android devices to version 7.x, existing web maps no longer launch successfully on the Collector for ArcGIS app. Additionally, when attempting to launch a web map, including the freely available 'Try it' maps, the map launches but loading does not complete. The layers and basemaps do not render.
This is a known issue. Upgrading on some Samsung Android devices may render users unable to open existing web maps unless a factory reset is performed on the device and Collector for ArcGIS is reinstalled. The issue is not due to incompatibility with Android 7.x, as the version of the Android OS is fully supported by the Collector for ArcGIS app.
The following is a list of Android devices that have reportedly exhibited this behavior after upgrading to Android 7.x:
Note: Other types of Android devices may also experience this behavior.
Warning: Before proceeding with the following workaround, back up valuable data or information on the device. This information is deleted from the device when a factory reset is performed.