Unfortunately this happend once in a while....
There are 2 easy ways to get past this....
1. Alt tab out of the game a couple of times and go back.... (the NPC's tend to move slightly down or left every time you press alt tab. so when you do this a couple of times, you can move Keith out from where he is hiding).
2. You can learn the tracking skill, and then find Keith and speak to him. As soon as you manage to click on him, he will jump back to an area where he is accessable.
