Configure Columns Width, Filter button disappears

Hi,
I am trying to configure the width columns in database to avoid rows growing to much.
I am using this configuration http://live.datatables.net/moyucek/1/.
If i don´t use { "sWidth": "5%" }, or any other percentage, my Search/Filter is there and works fine.
Link: http://imageshack.com/a/img839/414/r2dj.png
If i use { "sWidth": "5%" }, Search/Filter option disappears of the page.
Link: http://imageshack.com/a/img843/7056/mq26.png
What am i doing wrong?