Ah, there we go. Thank you for the help. Adding the height 100% to each .column fixed the issue. The updated fiddle: http://jsfiddle.net/xjkp9/3/
"please note that the same element (<div>) should not play the role of a Splitter pane and a nested Splitter at the same time"
I've been doing this in my app for some time now. I haven't noticed any side effects but maybe it's just because of the way I am using them. Do you have an example of unwanted resizing behavior in this configuration?