I'm seeing something new in 2018r2 under Windows and not OSX.
I have an app originally built years ago in RealBasic for Windows and Macs that I've been improving and upgrading until today. My main form has perhaps 20 timers--one used as a status checking loop, others used to open or close windows after some delay, etc.
I'm finding in 2018r2 under Windows that the timers are not firing. Neither Single- nor Multiple-mode timers ever have their Action event triggered.
I've not yet found a way to isolate the problem into a sample app.
Some other details: My app opens by hiding its main window, and in a method of the main window opens then by timer on the main form hides a splash screen, unhides itself, then opens a Recent Readings window. Some other windows are opened and hidden in preparation of future events. In r2, the close-window timer for the splash screen never fires.
As perhaps a curiosity but maybe important: many of the timers have a TabPanelIndex parameter, a couple also an empty InitialParent parameter.
Suggestions where to look are appreciated.