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Is it an ownership issue?
Are you using a non root imagemagick install installed in a path by a certain user and the other two accounts have permission to use this or are owned by the same user account and this 3rd account on another server path with another owner?
Usually installing Imagemagick with --enable-shared works for allowing it for all users on that box but I would have to ask does the user on this 3rd site have access to the server path where mogrify is at? See what is happening is the program is not finding that path and the file. Thus say your saying in vbGallery convert is at /usr/local/bin. Does this vbgallery file owner have access to see /usr/local/bin on that server. Maybe these other two accounts where installed with say your root user and this 3rd one not?
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