Hi,

I'm sure there is a simple fix to this problem.

Lines in certain layers keep disappearing. The lines will still be there, and when I select the lines, I can see them, but when I deselect, it will look like they are gone. When I zoom right into the lines, they reappear. I find this happens a lot when text or dimensions are added into the drawing. 

Is there a way to prevent this from happening?

Thanks!