Another issue. I've placed the correct configuration and yes the pumpkin was placed last as it should be. Before it is said, no it doesn't matter if it is a Lantern or a Pumpkin that is placed as doing this with the pumpkin still failed.
Either iron golem spawning doesn't work, you didn't put the pumpkin last, or you need a normal pumpkin. try those last two.
Scratch your whole post. I did place the pumpkin last -_- Maybe with the server reboot they are doing now will fix it. EDIT: Still nothing.
Minecraft has some goofy problems with direction. I haven't heard of Golems being affected by it, but try building one facing in the other cardinal directions: North, South, East, and West.