I have a page where there is a column and a content div, somewhat like this:
blahblahblah
Its a bug in the rendering engine. I run into it all the time. One potential way to solve it is to hide and show the div whenever you change the content (that in turn changes the height):
var divCol = document.getElementById('column');
divCol.style.display = 'none';
divCol.style.display = 'block';
Hopefully this happens fast enough that it isn't noticeable :)