I've got 6 doors in my map. 2 are func_doors and 4 are func_door_rotatings.

2 of the rotating doors work fine, but the other two only open from one side. They all have the One Way flag checked as I don't want them swinging into the door frames when they open, but this shouldn't affect being able to open them from both sides, should it?
As far as I know all four doors have the same settings. (Apart from the origins being at the other side on two of them, as they open the other way)

Any ideas?

Btw, here's a screenshot of the problem door.
http://www.imgholder.com/uploads/2004/12/31/01/doorprob.jpg

It will only open from this side (the outside), not from within the building.

No, but I will.

And about the door hitting the frame. Look in the screenshot I've provided. If the door opens outward, it will clip through the door frame. If it opens inward, it won't. Hence why I only want it to open inward.