I am working with a tutorial from the fs station site, which involves doing a flight from KLRF to KDYS. The tutorial indicates that I should start out with the FS9 default aircraft Cessna 172, load the flight plan and shut down everything in order to start cold and dark. I'm then supposed to select the C130 aircraft and go through the startup process.

I get all the way through engine startup and turning on the radios. When the radio is turned on, it's tuned to ground control at KLRF. The FS9 ATC prompts me to press 1 to request IFR clearance. I press 1, but nothing happens. Everything works as it should if I use the Cessna, but the problem starts when I select the C130 aircraft. How can this issue be fixed?