Cardiff City manager Neil Warnock was left fuming after his side suffered a fourth consecutive defeat, going down 2-1 at Queens Park Rangers.
The Bluebirds saw a goal disallowed and the chance of a second penalty ignored as they remain third in the Championship.
Joe Ralls put Cardiff ahead with a penalty nine minutes into the second half after Jake Bidwell was adjudged to have pushed Callum Patterson.
But Matt Smith equalised on 62 minutes when he rose to head in Jack Robinson's long throw-in and Northern Ireland U21 international Smyth struck with 18 minutes remaining.
Former QPR man Junior Hoilett found the net after exchanging passes with Kenneth Zohore, but it was ruled offside.
Cardiff protested, seemingly arguing that a Rangers player had touched the ball before it ran to Hoilett, but referee Tim Robinson stood by the decision following a lengthy consultation with his assistant.
Warnock is keen to add new players to his squad during the transfer window.