Odd scrollbar behavior

I have used the scrollbar a lot, and normally have no problems. However this time, I can't seem to figure out the problem.

Here is what I am doing. I put data into an array, then when then the student is ready to print a report of their activities, I navigate to frame the text field and scrollbar is on, I compile this data (an array) and stick it into a varible (myreport), then stick it into the text field. Almost always, the scrollbar realizes there is enough info to display a scroll bar, but after I go to the frame a few times, it quits working.

Anyone seen this before? any ideas what the problem might be?

I am using myreport as the varible to hold the data, then I have this line of code:

_results.text=myreport;

The text field does have all the data in it correctly, just the scrollbar is greyed out... very frustrating I also have noticed that the scroll bar does not have its UP and DOWN buttons in the authoring environment. Yet, if I build a new fla, it do get the UP and DOWN arrows..

thanks for any help on this!