I had a guy do it, and I can't seem to get him back out here to look at
it, but he's aware of it. The house was in for over a year before the
patio, so most of the settling should have been done, and the same guy
did my other flatwork around my house with no other cracks, so I'd
guess it's a bad guess on the expansion joints (we had a hard time
deciding with all of the curves in the patio (it has rounded edges, and
several turns).
The crack is just outside where the door exits. I'm fairly sure that
the prep work was done well. No other cracking is evident at this
point, and the crack itself is fairly stable (it's been there since a
few months after the install, and has maintained.
Maybe I'll just wait until next summer/spring, then cut it out and redo
that section.