In my post above, I assumed that you meant the text runs off in the textbox as opposed to just stopping completely. I believe that using & in the text file tells the .swf to stop reading the text file at that point.
As for “the scroller” I am going to assume you mean the scrollbar, and one from the components panel as opposed to a custom one. If so, make sure it is assigned to your textbox. If you changed the instance name of the textbox, that may cause the scrollbar not to work with it because it was assigned to a textbox with a different instance name.
If that is the case, select the scrollbar and go to the properties panel. There, you should see the instance name of the textbox it has been assigned to. Change this to the current instance name of your textbox.
