When I started the PC, it was unresponsive due to SEP overly taxing the system. Using Control Panel, I uninstalled and reinstalled SEP. On bootup, the Task Manager showed 4 LU Callback Proxies + LU exe. The LU popup showed up sequentially a number of times. (Only the first one actually updated; the remaining tries indicated that SEP was up-to-date.)
How can I get one and only one LU to run?