Same here ... it seems that when two monitors are positioned above one another in the Display settings in Windows, PT doesn't know where the bottom of either screen starts and stops. When side by side, it folds the lists correctly. The thing that gets me is that the AVID lists have an arrow at the top and bottom to scroll no matter what screen or window is used, but the same doesn't apply to the Bus list or the WAVES plugin list. That tells me they know how to make it work but don't have the programing needed in PT to address it. Should be a relatively easy fix for a good programmer since it already exists in one section of the code ...
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