Are there interferences in the assembly? These can cause parts to disappear in a drawing that is displayed in HLR (Hidden Lines Removed). As a check switch the view display to HLV (Hidden Lines Visible), if the lines you're missing show up as hidden lines you know that SolidWorks is having problems calculating the visiblity of part due to interferences.
Sorry for the delayed response Greg. Unfortunately that is not the issue. The angle iron sits flush against the plate like the other 3. However it's only that one that disappears. What is really odd is if I create a new drawing, that view comes in fine without issue. I ended up just sketching in the lines I needed and no one is the wiser.