No longer works at all - shuts itself down after about 10 seconds. I have tried deleting cache, deleting all data, deleting all data and restarting the device (Samsung tablet), uninstalling sand then reinstalling, trying to find remnants of it in File Manager, deleting them, and then reinstalling again, re-logging in when it opens, etc. All to no avail and a big waste of time. Was merely ok even when it worked.