There is not much to explain...

I was making a house mod and then i was just about to place a map marker.
So regulary i was about to place xMarkerHeading but when i placed it, there was nothing, it was invisible or something.
I can't even click it. But the thing is that it appears on object list... Please, could someone help me ? My whole work would

be useless without a map marker.

EDIT: I solved it by disabling ENB... it was taking too much resources