I have the same Problem: All my solid boosters show up with "Engine State: Invalid". And once they are started, they won't run out of fuel: Though the fuelscale reading reaches eventually zero, the boosters just keep running at their full power forever. Every Mod is up to date: Real Fuels v7.3 and Engine Ignitor v3.3. (From the Engine Ignitor archive I didn't install any of those "extract to use"-zips, because it is written that when used together with Real Fuels, one doesn't have to.) Is there a fix to the mentioned Problem?
