Well after a TON of research on the net, reading all about ImageMagick and Mogrify, making damn sure it wasn't my problem in the script, I came across this little page which is my
EXACT problem:
http://studio.imagemagick.org/piperm...ay/001273.html
Turns out my host has Version 5.4.7 of ImageMagick installed. I've put in a support ticket for them to upgrade to 6.2. I'm hoping that will solve the problem.