DataTables FixedHeader, DataTables Sorting plugins, search option are no long on big table.
At first I thought that it was problem with W3 Total Cache again so I tried to disable the plugin but it still the same. Those functions work on small table but not on big table with 200 rows.
When check the page source, I still see TablePress JS.
The most recent change I had that is upgrade to latest Genesis Version: 2.0.1 · Released: August 21, 2013. I'm not sure if it cause the problem.
I hope you could have a look into this.