It takes half an hour — forever in movie time — for this relationship comedy to get going. But when it does, Jennifer Aniston, as a corporate type who buys ghastly motel art, and Steve Zahn, as the night manager at his parents’ Arizona motor inn, do quiet wonders. Smarting from her split from a yogurt tycoon (a splendid Woody Harrelson), she lets the nerd touch her butt. Something happens. I can’t describe it. But it’s not formula and it’s not TV. Playwright Stephen Belber (Match), in his directing debut, comes close to the sweet spot. He’s not there yet. But he’ll be worth watching next time.