Husqvarna YTH24V48

First use of my brand new Husqvarna today. The grass was a bit long and damp but set blades at highest setting and seemed to be coping well - but then I noticed that the blades were not disengaging when the attachment clutch control switch was disengaged - still rotating - and I could get off the mower. The position of the clutch control switch made no difference to the engagement of the blades although with switch set at engaged the engine did cut out if I tried to get off the tractor. Now whenever I start the tractor the blades automatically engage and can't be cut off. Any ideas???

Needs to go back to dealer and let him figure it out. Would be a warranty issue, as well as a safety issue.