Encountered with both FM 15.0.1 and FM 14.0.5
OS X 10.11.4
MacBook Pro (Retina, 15-inch, Mid 2015)
While building a FM app I have noticed several times that a portal will stop displaying data. Sometimes this is just certain fields, sometimes it is the whole record. The only workaround I have found is to recreate the portal from scratch
In the latest instance of this problem I have a portal that is acting up and right underneath it I have recreated a new portal. The old one displays no records while the new one works fine.
I have tried restarting FM, tried different FM releases, and tried rebooting my laptop but once the problem starts it does not go away.