Storyline 3 - Trigger Panel won't resize

Resizing the layers or triggers panel in SL3 is broken. I can't expand the triggers, and if I expand layers, I can't scroll the triggers or see those at the bottom of the list. If I reduce the size of the layers panel, it leaves a lot of whitespace rather than expanding the triggers panel. (Video attached) 

Anyone else having this problem?

 

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