After installing WYSIWYG v6.0.3, I published my website. A 'master' element is embedded in 80% of the 1800+ pages that comprise the site.
The 'master' element is a 'Kick-butt Mega-Menu' so it must be set as the 'front' element of every page on which it appears - otherwise the drop-down menu elements would disappear behind other layers.
The first image, below, shows the 'master' element bounding-box and it's vertical-height.
The second image, below the first, shows the 'master' element bounding-box after it has been manually resized (which had been the dimensions of the bounding-box since version 11 at least.