"The Perplexed" should be one of the events of the theatre this spring. A Richard Greenberg script directed by Lynne Meadow and presented by the Manhattan Theatre Club – what could possibly go wrong? As it turns out, the script leaves this production snake-bit from the beginning. A glorious set and a solid cast can not make up for the fact that the script is overly long and the characters rather unengaging. The action all takes place in the library of the Fifth Avenue apartment among various members of two families. The Resnicks and the Stahls have been involved with one