Here's an interesting one. The New York Observer reports that Michael Werner Gallery is suing collector James Rich over a painting that was allegedly supposed to have gone to the Carnegie Museum (where Rich is a trustee) but did not:
"The painting in question, 'Red Boat (Imaginary Boys)' (2004) by Peter Doig was sold to Mr. Rich for $162,000 in 2004 but is now up for auction at Christie's where it’s expected to take in between $2,289,000 and $2,943,000. In the meantime, the Carnegie Museum was meant to assume full ownership, but Mr. Rich claims to have donated a percentage of the painting and then bought it back such that he still owns it."