I haven't tested this, but I would suspect this behavior is coincident to wherever these Manage lists contain OS non-standard buttons. For instance, Manage Custom Functions has a bottom and buttons like this:
The buttons are normal OS X buttons, and they respond to mouse-down, not mouse-up. This bug does not exhibit itself here; the scroll state maintains itself. Most of FM11 is like this.
Manage Layouts (which is godlike, BTW), looks like this:
Icons that are foreign to the OS, on strange square buttons, that don't respond until mouse-up. Manage Scripts is like this too. This bug exhibits itself in both of these dialogs.