a new regulation (Version 5.0) was adopted in 2006 which caps the maximum amount of "stock" a machine can hold to around 2,000–3,000 coins' worth of bonus games. Moreover, all pachisuro machines must be re-evaluated for regulation compliance every three years. Version 4.0 came out in 2004, so that means all those machines with the up to 10,000 coin payouts will be removed from service by 2007. Jackpot disputes Electronic slot machines can malfunction. When the displayed amount is smaller than the one it is supposed to be, the error usually goes unnoticed. When it happens the other way, disputes are likely. Below are some notable arguments caused by the owners of the machines saying that the displayed amounts were far larger than the ones patrons should get. United States of America Two such cases occurred in casinos in Colorado in 2010, where software errors led to indicated jackpots of $11 million and $42 million. Analysis of machine records by the state Gaming Commission revealed faults, with the true jackpot being substantially smaller. State gaming laws did not require a casino to honour payouts in that case. Vietnam On October 25, 2009, while a Vietnamese American man, Ly Sam, was playing a slot machine in the Palazzo Club at the Sheraton Saigon Hotel in Ho Chi Minh City, Vietnam, it displayed that he had hit a jackpot of US$55,542,296.73. The casino refused to pay, saying it was a machine error, Mr Ly sued the casino. On January 7, 2013, the District 1 People's Court in Ho Chi Minh City decided that the casino had to pay the amount Mr Ly claimed in full, not trusting the error report from an inspection company hired by the casino. Both sides appealed thereafter, and Mr Ly asked for interest while the casino refused to pay him. In January, 2014, the news reported that the case had been settled out of court, and Mr Ly had received an undisclosed sum. Problem gambling and slot machines Natasha Dow Schüll, associate professor in New York University's Department of Media, Culture and Communication, uses the term "machine zone" to describe the state of immersion that users of slot machines experience when gambling, where they lose a sense of time, space, bodily awareness, and monetary value. Mike Dixon, PhD, professor of psychology at the University of Waterloo, studies the relationship between slot players and machines. In one of