Unexpected Behavior of Scrolling Panels

I'm working on a mock-up of a data entry screen and need to show two scrolling text fields. To keep things clean, I created layers for each of the fields and inserted scrolling panels containing text boxes into the respective layers. In slide view everything looks fine and works as expected.

When I preview the slide, I can scroll the text with the up and down controls in the scroll bar.

However, the thumb (sometimes called the slider or scroller) occupies the entire scroll bar and when I click the thumb, the text disappears.

If I click the up or down controls, the thumb also disappears.

Can anyone explain why this happens and what I can do to correct it?

I am running update 3 of Storyline on Windows Vista; 96 DPI; LCD monitor at 1280x1024.

Thanks,

Mike Harris

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