I just received a rejection from SS that I have never seen before, here it is:
3D Title/Keywords Requirement -- 3D images require the phrase "3D illustration" or "3D rendering" in the title and keywords.

Now the 3d render I used underwent extensive processing and doesn't look anything like a 3d render in the final image. I usually put '3D render' in the keywords for any 3d render I upload, but for this image I didn't because it wouldn't appeal to someone searching for 3D content.  I guess I'll have to do it from now on for any image that uses any 3d content at all. BUT they also want '3d render' in the TITLE as well -  What the h*ll? I swear they've got someone on the payroll whose sole responsibility to find new ways to drive us all nuts. 

Interesting, the system wouldn't allow me to use the alternative word for Hades, so I had to spell it h*ll. Seriously? What the h*ll!

http://forums.submit.shutterstock.com/topic/88138-3d-content-policy-change/

^^Thanks.