Comment 29 for bug 628372

What happens if you install just libzeitgeist-1.0-0, but *not* libzeitgeist-gio?

I'd be surprised if libzeitgeist alone should cause this. libzeitgeist-gio installs a GIO module that logs in Zeitgeist every time a GDesktopAppInfo is launched. This way we can track "most popular apps" and other cool stats about your app usage patterns.

So the most likely cause of the problem is that this GIO module somehow messes stuff up with Docky... I can't see what this should be off the top of my head, but we'll get to the bottom of this :-)