I built a test program to see if timers work at all using DateTime.Now and TimeSpan functions with a simple 1 minute offset. That still functions. The Advanced Smart Lights code doesn't do anything more complicated other than storing the timestamp in a module parameter and utilizing the HistoryValue array. Since I've looked at the parameter value and can confirm that it's set to a value that seems appropriate and I have seen that the values within HistoryValue above element 0 do not exist, I believe I have narrowed this down. However, I have no way to fix it. I guess I'll just migrate back to r493 or earlier so that I can get my system working. It looks like there are a number of people using my APP as well, so I'll recommend in that thread that they migrate back/don't update until a resolution is found.