In a new twist, New York’s now defunct Knoedler Gallery, which has faced several lawsuits in the past few years for selling forged works attributed to Jackson Pollock, Mark Rothko and others, is now being sued by its investor David Mirvish for failing to sell two authentic works.  The gallery shut down after allegations of selling a fake Pollock for $17 million came to light, effectively breaching an agreement between Mirvish and the gallery to sell two Pollock masterpieces.  “David Mirvish, one of the world’s foremost art collectors, fervently believes in the authenticity of the works and is determined to receive that to which he is entitled,” said Mirvish’s lawyer, Nicholas Gravante Jr.