Hi David,
How close are you getting?
If you're the playing the ISS rendezvous mission, one way to approach the ISS is to:
1) RETRO relative to the ISS until relative velocity is about 0m/s
2) DIRCT fly towards the ISS as close as possible, to within 1km distance
3) RETRO to bring down relative velocity to 0m/s again
4) and then use MANUAL control to dock.
5) when you get really close, switch to RCSTRANS go move into place for that final bit
If you don't see the docking port which has a red light, CPLAN (coplanar) will point the Shuttle in that direction so you can maneuver your way there.
We will try to do a video to demonstrate this.