New Post: change image orientation.

Yep, that's the problem. You need to install latest native Ghostscript library.

Download and install native Ghostscript library 9.14 from http://www.ghostscript.com/download/gsdnld.html

If you have 64bit system, I would suggest you to install both 32 and 64 bit libraries side by side.

Cheers,
Josip