Dimension/Leader arrowheads will not display

When I place a dimension or leader the arrowhead(s) will show until I accept the placement THEN the arrowhead(s) disappear. I thought that maybe the arrowheads might just be very small but when I dropped the dimension and select elements only the lines were found. The arrowhead is a cell. I changed it to a different cell, something weird just to see if it would work and it did work. I placed the cell into the drawing with no problem too. I even copied a dimension from  another drawing, imported the dim style but nothing seems to work.

Does anybody have an idea on why this is happening,

Thanks

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