So, basic information: Windows 10, i5 3.0 ghz CPU, 16 GB of DDR3, Geforce TI550 video card.
My install of KSP has no mods.
I am attempting to put a fuel tank into orbit using a Probodyne OKTO2 probe core. I am using an RCS system. However, the SAS is COMPLETELY useless. The buttons are available for prograde/retrograde, normal/Antinormal, and radial/antiradial, but none of them do anything. While ascending, I click the prograde hold button to turn over into an orbit, but the RCS does nothing, the rocket flies straight up. I click radial, nothing happens. If I manually steer the ship, it will act as if it's on the standard stability hold. I have put my navball into orbit mode, target mode, and surface mode, and it does not change anything. I'm in career mode and have no pilots available for this mission, and it needs to be a one way trip. I also have no other probe cores available with prograde/retrograde hold, which I need for this mission.
Am I missing something here?