Invisible faces in 3ds max

[dominikmateasik]

allright,chillin,modelling all of a sudden i realize some objects miss their faces, on some of them just couple of faces aregone,some other vanished completely. The funny part is they r still there,the objects do have their wireframe, i can select those invisible faces and they still get red, when i put the object in see-through mode i can clearly see the semi-transparent faces thus the whole grey object as it should be....but in normal mode,there are none to see

 

now ive tried to flip them all,convert objects to sth different like mesh and convert back to poly,apply various modifiers,restart max and everything,it just doesnt show,and of course im not in wireframe mode

 

thanks in advance