Las Vegas Sands Corp. said Wednesday financial issues surrounding the Macau gaming community resulted in the casino company reporting a 19.4 percent decline in revenue and 30.1 percent drop in profits during the second quarter. For the past year, visitation by gamblers to Macau has been hampered by various challenges, including economic downturn, a crackdown on corruption by the mainland Chinese government against junket operators, a potential smoking ban, and tourist restrictions.