So I finally finished the assembly files of a few fishing rods I designed in SolidWorks 2011 Educational edition.  I've used the PhotoView 360 add-in before for university projects, and for some reason, my sketches won't appear in the Integrated Preview, Preview Window, or Final Render; all I get is the background.

This same thing happened a few days ago and after staying up til 4am, I can't remember how I fixed it... It's not a computer-related issue, as I have 6gb of RAM and 2 gb of dedicated memory; up until a few days ago, I've rendered tons of sketches without this problem.

Here's a link to a similar question I found in Google and I tried the suggestion mentioned, but it doesn't have any effect:

https://forum.solidworks.com/message/252016

Please, any help would be extremely appreciated.

Cheers