Makerbot Replicator 2X - Does not know I have 2 extruders

Most commonly when you upgrade Firmware often the Replicator 2X defaults back to a REplicator 2 (with one extruder)

Simple to fix. 

On the LCD menu go to :

- >Info and Settings

->General Settings

->Tool count

Change this from Single to Dual

Also check the next item down "Heated Plate" should be YES