Thanks for continuing to use this service, or at least not unsubscribing.
Foursquare changed up the interface that we use to load your check-ins
and that threw a monkey wrench in the works for the past couple weeks.
As a result of that the emails stopped getting sent. But it also means
a long overdue upgrade is on the way, complete with new support for
photos and some other niceties.
You'll know it's done when you start receiving emails again.