run the attached example

resize the browser width... everything works ok

move the horizontal scrollbars to the right, and then back to the left (1st position)
resize the browser width... when reducing the browser width the columns start to increase their width

move the horizontal scrollbars to the second position
resize the browser width... now the columns flicker

also check this screencast
http://screencast.com/t/WWQiNW0yT89l