There is an issue with the autoscroll plugin for the scrollable object. If you use the nav while it is autoscrolling, it causes a strange double scroll when the next autoscroll fires. It is like it creates a new timeout without removing the first one.

Steps to repeat:

1. Go to http://flowplayer.org/tools/scrollable/autoscroll.html
2. Click Play
3. Let the autoscroll fire once
4. After 2 seconds, click the left arrow nav button to go back one slide
5. Watch what happens when the autoscroll fires in the future

In fact, if you click the nav multiple times, it seems to create additional timeouts for each click. You can really get this thing to freak out!

(copied from http://flowplayer.org/tools/forum/35/83512)