@Wonko: Much appreciated that you included it. (I must admit I'm proud of myself, even if it was something you could've done yourself, and even though it was rather simple in retrospect. It was still some of the most advanced python-ing I've done - because so far all my other python is within the confines of the clock style - which means I don't have to spend too much time understand how all the higher-level stuff works. This was across multiple .py files, which was new to me.)

pusak gaok:
Either your /etc/hildon-desktop/status-menu.plugins file got messed up, or /usr/share/applications/hildon-status-menu/clock-plugin.desktop file got named wrong. (This is linked to the different ways in which Adv. Clock installs itself.)

To better diagnose your problem, paste the outputs of:
...and:
Then we can go from there.