This morning again the situation failed to change after leaving home...
My config goes like this:

• At home: based on list of cell IDs, turn off mobile data and bluetooth and turn on wifi

• At work: based on list of cell IDs, turn on mobile data and turn off wifi

(there's also "Near home" with situation!="At home" but since I had my wifi AP missing from the "At home" conditions, "Near home" wasn't actually working as meant at that time)

The cell ID sets consist of two non-adjanced physical areas, so basically the situation should've changed once on my way to the office and another time when I reached it. Now it did finally change after I modified the "At home" situation (added the missing wifi AP condition) which I guess triggered not only re-evaluation of that situation but also re-evaluation of all other rules since "At work" also got activated immediately. The phone was locked (device lock, display off) while I was on my way, but unlocking it had no effect.

Also, before leaving home I was experimenting with the "baseline" thing: I closed Situations app (swipe from top), went to settings and set things up as I want them to be when there's no situation active (or Situations is not running) and restarted Situations. The active situations were correct after start-up, but they didn't seem to affect the settings (e.g. mobile data was not turned off). Should I have also killed the background process (via Terminal) to have Situations completely shut down? Is the GUI process actually even needed for the rules to be effective?

Anyway, as I noticed that the settings were incorrect for the active situations, I manually deactivated "At home", which automatically activated "Near home" as it should (and I guess "At home" got automatically activated shortly after that). Thus, the app seemed to be running ok just before I left home.