Sometimes when I press G or gg I get this error:

resource://dactyl/buffer.jsm: 1634: TypeError: options is undefined

and nothing happens (i.e. page stays the same, no movement). Not sure what is causing it. It seems to happen randomly. It goes away after I change tab and do some browsing.

Let me know if there is anything I can do to help you debug this.

Edit: Apparently there is a pull request for this #8