The fun wonderful world of computers Kathy --- I realize that many times with my other hobby of Flight Simulator X with Microsoft, it can suddenly "Stop" working the way it was and you don't change anything. 

Odd that it happens, but these hiccups can and do occur :sad:

 

Poser Pro 2012/3DS Max 2013/Adobe Photoshop Elements 10/Zbrush/

PC: HP Z820 Workstation, 3.30 ghz 8 core Intel Processor, 2gig nvidia Quadro, 16 gig of Ram and 2TB Hard Drive.