Although, I do think it would be good to put in a warning if tiff preview is activated in the file being processed. It seems that a flaw which removes plot lines would be something of which the user should be made aware (along with the quick solution)!
15 Mar 2012
Improves the style of lines in MATLAB generated eps files
After hours of searching, it would have helped if I scrolled down the page to realize that I simply needed to remove tiff preview. I have no idea why my previous "workaround" worked, but it did. Thanks for your help, works great.