I play the single player with an Xbox 360 controller on the PC. I'd like to report that if I have both the C4 and rocket launcher, I cannot use the rocket launcher until I have expended my C4. I use the default scheme, pressing right on the gamepad to access the explosives. Pressing it again switches back to my main weapons.
If I have overlooked something or if anyone is able to help, I would appreciate it.
Thanks.