In “Proof,” Catherine is a woman who doubts her own sanity, after her dad dies. And when her sister Claire arrives from out of town, her tension and doubts become much too apparent. Claire doubts her sister’s sanity, and after the first twenty minutes you will, too. Madden’s film is based on the play of the same name, and judging by the way the entire film is conducted, it’s not hard to fathom. “Proof” conducts itself like a play. There are simple and scarce set pieces, all of which are there to serve the actors who stand around trading dialogue at rapid fire paces, screaming at the top of their lungs. They think it’s dramatic, but often times it’s utterly shrill.