On April 19, 2011, Moran, three of her Happy Days co-stars—Don Most, Anson Williams, and Marion Ross—and the estate of Tom Bosley, who died in 2010, filed a $10 million breach-of-contract lawsuit against CBS, which owns the show. The suit claimed that cast members had not been paid merchandising revenues owed under their contracts. Revenues included those from show-related items such as comic books, T-shirts, scrapbooks, trading cards, games, lunch boxes, dolls, toy cars, magnets, greeting cards, and DVDs with cast members' likenesses on the box covers. Their contracts entitled the actors to be paid five percent of the net proceeds of merchandising in the event that a single actor's likeness was used, and half that amount in the event that the cast members were pictured in a group. CBS said it owed the actors between $8,500 and $9,000 each, most of it from slot machine revenues, but the group said they were owed millions. The lawsuit was initiated after Ross was informed by a friend playing slots at a casino of a Happy Days machine on which players won the jackpot when five Marion Rosses were rolled.
In October 2011, a judge rejected the group's claim of fraud, thereby eliminating the possibility of recouping millions of dollars in damages. On June 5, 2012, a judge denied a motion to dismiss filed by CBS, which meant the case would go to trial on July 17 if not settled by then. In July 2012, the actors settled their lawsuit with CBS; each received a payment of $65,000 and a promise from CBS to continue honoring the terms of their contracts.