After being away from the sim for 2 months Ive just started a cold n dark flight in the NGX 737 with the lovely Korean FO, everything going along fine and we get to start engines ....and then...the dreaded 

 

"were not properly configured for engine start"  

 

whats going on with that? that never happened in the 100 or so previous flights. Anyone care to comment?

check the isolation valves

thanks will do. The FO though is supposed to control everything during the pre start phase