Playing around with this a bit more....the problem seems to be related to the horizontal compression of the chart...at max chart compression, when the vertical lines are applied...for me are they are almost always unclickable...but if you expand the compression 4 or 5 levels vertical lines placed then are (almost) always clickable...
In your video example linked below, your chart was not compressed that much...perhaps that is why it worked OK for you.
My charts are generally set at max compression on a 24" LCD 1920 X 1080 monitor (or 1600 X 1200 on another monitor for example.)...even on a 1280 X 1024 17" LCD, at max compression vertical lines are often unclickable...
Maybe take a look in this direction...
Thanks...Alfred
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