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When upgrading certain Android devices to version 7.x, existing web maps no longer launch successfully in 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 some Samsung Android devices may not allow users 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 with the Collector for ArcGIS app.
The following is a list of Android devices that have reported to exhibit this behavior after upgrading to Android 7.x:
Note: Other types of Android devices may experience this behavior, as well.
Warning: Before proceeding with the following workaround, ensure to back up any data or valuable information on the device, as that information is deleted from the device when performing a factory reset.