Dreagan

PFPX already does a proper fuel calculation. All you need to do is plug in those numbers into the PMDG FMCs. TOPCAT (Take-off Performance and Calculation Tool) as its name says was originally thought to be used to calculate optimum flaps and V Speeds. Not to plan fuel and pax loads. But yes I hope that FSS will make the necessary update to TOPCAT available soon.

make sure LK is not on which locks the panel to stay open no matter what.

That is not a valid Lufthansa registration as it stands anyway. Lufthansa uses the following registration scheme for their aircraft. D-AIXX - Airbus Aircraft (Passage) D-ABXX - Boeing Aircraft (Passage) D-AEXX - Embraer Aircraft (Regional/Cityline) D-ACXX - Canadair Aircraft (Regional/Cityline) D-ALCX - McDonnel Douglas MD-11 (Cargo) D-ALFX - Boeing T7 (Cargo) - First deliveries due in October of '13 Note that there will not be a T7 Pax Version for Lufthansa but instead LH orderd 6 777-300ER for their daughter Swiss which are to replace the older A340s