Win 7 PC was running an older version of DF from about 2012 and I installed v16.3 over the top of the older version yesterday.
DF starts with a shortcut in "All Programs / Startup" as before, however the start does not happen until I log in to the PC, then it starts up normally. Or perhaps it executes but waits for a user logon. In any case. I don't do anything to initiate the start; on logon I see the startup splash screen and then the program runs normally. There is, of course, a gap in the logged data from the time of the reboot until a logon occurs.
???