I flipped the stem on my cross bike over the other nite. Rode it today. My King HS was rubbing. Top cap wasn't level and it was rubbing on the front lip of the top of the cups.
So I flipped the stem back over tonite (wow! is it humid!) and its fine.
I think it may be that its been installed the same way since I got the bike 6+/- years ago and things are compressed in a certain way.
I need a new cross fork anyway, this just accelerates the 'need' for it.