I have a similiar yet different problem. Once I have the flight loaded, I cannot change the fuel quantites via FSX fuel and playload system. I must put xx% in the tanks BEFORE loading the flight. It is only a minor inconvenience but I always like to do two sectors (outbound and inbound) and turnaround fuel cannot be gotten unless I exit and reload flight or fill the centre tank. This works for short hops but not long as centre tanks isn't enough to rech destination.

Has anyone else had this problem or a solution?

Cheers,
EI678