I had set up an Agenda view for showing today's tasks and TODOs with tags "UPCOMING" or "PROJECT":
(setq org-agenda-custom-commands
'(("w" "Agenda + TODOs"
((agenda "" ((org-agenda-ndays 1)))
(tags-todo "UPCOMING")
(tags-todo "PROJECT")))))
Now, after updating org-mode yesterday, it still works fine, but instead of showing just today's tasks, it shows the entire week.
Any idea what might have caused this?