After closing the SecureLogin client any attempt to re-launch fails. There are no error messages but the client will not start and the systray icon never appears.
After closing the SecureLogin client (sltray.exe) the process sldotnetsso.exe remains running. If the user kills the running process sldotnetsso.exe then sltray.exe will load as expected.
Edit the SecureLogin preferences and disable the Flash monitor.
Web->Start the Flash monitor/automation worker
Set to No