DIMENSIONS AND LEADERS NOT SHOWING UP

I am a fairly new user of Microstation Plant Design.  I have used Microstations for about 2 years off and on and have never had this problem. When I try to dimension something the dimension dont show up. ( no dimensions,  arrow heads , nothing)

Is not the level being on or off, for I can draw objects in the same location.  Its not the position of the dimensions in 3Dspace.  for I can draw objects and see them. Its not the section of the dimensions in the dialog box , for it is deselected.

Also I can open other drawings and have no problem putting dimensions on objects.

Thanks for your help in advance cliff