File opened but with "errors"

 

 

Hi,

 

I have a particular dwg file that I am trying to open on my computer. However, as seen in the screen shot, some of the lines go missing! On my friend's computer the lines are there. This is strange as we are both using the default settings and have not played with the settings at all.

Does anyone know how I can resolve this? Could it be some settings that is wrong in my copy of draftsight? Thanks in advance!