IU 9.0.2 quickdoc overlaps popdown completion list

The quickdoc popup has a annoying usability problem when completing properties/methods in java / actionscript / mxml. The quickdoc keeps overlapping the completion popup menu.
I file a youtrack issue, IDEA-54709 "quickdoc overlaps popdown completion list."  The severity of the overlap depends on where your caret is in the editor and how close you are to the edge of the screen. I'm wondering is anyone else seeing this problem, or is it something to do with my settings?  The problem is repeatable for me everytime.

Version IU 9.0.2

Thanks,
-Alex

press CTRL+space to complete a property. If I pause for a second, the quickdoc pops up next to the completion list to show me the property value.  So far, everything is fine.
But if I then press DOWN_ARROW to goto the next property in the completion list, the quickdoc window repositions itself so it is overlapping the completion list, which is very annoying.