I just downloaded the enonic cms to try it out, but almost filed a bug report with them as their menu panel was completely empty. I just tried running it in IE and lo and behold it worked! Turned out it worked in Opera stable also, but no go in Opera Developer. I created a JSFiddle that recreated the "bug" I'm not sure if it is a bug or just being stricter to the standard then everything out there. If the 100% height on any of the divs is removed the text appears. The same applies to removing the overflow styles on either div, or the display: table on the outer div.