irrlicht camerascenenode problem

Maybe Gimbal Lock.
I cannot help you with your code. But when I need something like turn I am writing something like this:

Function Turn(LNode:T_irrISceneNode , TurnX# , TurnY# , TurnZ#)
	Local Turn:T_irrVector3df = T_irrVector3df.createFromVals(TurnX , TurnY , TurnZ)
	LNode.setRotation(LNode.getRotation().Plus(Turn) )
End Function

edit:
or with out the local

Function Turn(LNode:T_irrISceneNode , TurnX# , TurnY# , TurnZ#)
	LNode.setRotation(LNode.getRotation().Plus(T_irrVector3df.createFromVals(TurnX , TurnY , TurnZ)) )
End Function