Shepards' power wouldn't work, no error message

[EvilCat]

Hello! Thank you for a tremendously helpful tool! I'm basing a monster breeding video game (non-commercial) on IM's operations with color and shape.

However, there's one function I can't get to work: changing shepards' power. Even when I use straight examples from this very website, like here and here, I get the same image as a result each time. There's also no error message.

I use CentOS 6 and ImageMagick.i686 6.5.4.7-7.el6_5 package. Maybe it's a dialect problem? I noticed some differences between official documentation and the package. For example, it only responds to NearestNeighbor and not to NearestNeighbour.

[snibgo]

v6.5.4 is very old. Shephards power is more recent than that. I suggest you upgrade.

[EvilCat]

Thank you! I'll to that. This was the latest in "updates", so I thought it was latest.