Vent lines messed up on one computer?

[hydro]

Hi, just a quick question. at my office everyone has autocad 2006 on there computer. for some reason on just one of the computers 1 line type doesnt show up right. Its a vent line that shown in the pdf let me know if there are any ideas, thanks

[Norts]

it looks to me like that particular linetype contains some form of shape.
it would appear that the shape file can be found on all of the machines, except for 1, thus the gap appears in the linetype where the rotated v should be.