My lights turned on early - in fact, about an hour early. So, the WM100 thinks I’m in a non-DST area. I had to go in and add 60m to all my dusk timers. Lovely. Silly me for upgrading.
Update: before the WM100, I was using my "low-tech" PR511 flood to turn on my lights at "real" dusk. Quite reliable, unless it gets super dark in the middle of the day due to a storm. That rarely happens. So, I’ve deleted my WM dusk timers, and I’m back to the PR511...for now. Forever?