I've just uploaded an updated version of my comment scroller. Download here. This update makes the script work correctly when hidden comments are loaded (e.g. via the "load all comments" link). Thanks to Oscar Cunningham for prompting me to finally fix it!
Note: Upgrading on Chrome is likely to cause a "Downgrading extension error" (I'd made a mistake with the version numbers previously), the fix is to uninstall and then reinstall the new version. (Uninstall via Tools > Extensions)
For others who aren't using it: I wrote a small user script that allows you to jump through the green-bordered new comments quickly. More information here.
Very much a 101 question.... how do I download your program?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.