The Illinois Racing Board disqualified Glen Hill Farm's Indy Groove from her victory in the Sept. 3 Arlington Matron (gr. III) because the mare tested positive for naproxen, an anti-inflammatory (Class IV) that is prohibited on race day in the state. Trainer Tom Proctor was fined $1,000. The 5-year-old daughter of A.P. Indy had posted a 4 1/2-length victory under jockey Mark Guidry in the $150,000 Arlington Matron.Stewards ruled runner-up Quick Temper the new winner.The ruling in no way affects the pari-mutel results of the race.