when the FTL is 100%charged the engage button is still gray(cant press) mods: bounty hunter 1,000,100,100 Advance vanilla Drone++ Additional weapons Part Galore Railgun accelerator kit Speed set not sure if im using all of it but they were on
I'm guessing you probably can't save the game either, right? If so, this is a bug (which exists in vanilla but is made much more common by some mods) that I think should be fixed in the next update.