I remeber the path to mogrify changing when Jeremy had to reinstall the OS on zen. The old machine had the path to mogrify (ImageMagik) as:
/usr/bin/mogrify
I've just checked running: whereis mogrify
on the new server and just get:
mogrify:
Which I think means ImageMagik isn't installed. Can you install that and let me know what the path is so I can change the PhotoPost config file. Thanks!