After a short hiatus of movie theater experiences at the Sherman Oaks Galleria this summer, Pacific Theatres reopened their doors as an ArcLight yesterday in a soft launch, preparing for the official December 14 grand opening. This will be the second Arclight in Los Angeles, the first being in Hollywood. In addition to the ArcLight's standards of reserved seating, no lines, large seats, 21 and over screenings (what will all those teens do now?!)......