Same for me. Just returned from LAX, c10 hours of flying and no T3 on arrival. Its not the first time its happened, seems to happen only when arriving into the field, not if you load into LHR for departure. I've tried the various fixes mentioned above and none of them work. If I go back to "main menu" and re-load onto the same stand as I parked at on arrival, the buildings appear as normal.
Very frustrating!!