Angry Cardiff manager Neil Warnock criticised referee Stephen Martin and fourth official Andy Woolmer after his side snatched a late 2-2 Sky Bet Championship draw at Reading.
Reading led 2-0 at half-time through an own goal from Cardiff midfielder Callum Paterson and a 20-yard deflected shot from Mo Barrow - both following Liam Kelly corners.
After Warnock had been sent to the stand in the second half by Martin, for persistently protesting at his decisions, Cardiff launched a furious late rally.
Joe Bennett volleyed home seven minutes from time and substitute Lee Tomlin snatched the equaliser. Reading then almost grabbed a winner when Paul McShane nodded against a post.
Cardiff's run of four successive wins came to an end.