Hey, I just wanted to report that FixedHeader (left) doesn't work with TH elements. Obviously it makes sense that if you want to lock the left part, it's some kind of a header and dataTables itself supports TH elements in the table body.
Quick fix for current nightly:
Line 746:
Change:
$('td:gt(0)', this).remove();
To:
$('th, td', this).filter(':gt(0)').remove();
Anyway, still having some other strange Issues with FixedHeader left.. like positioning issues and it seems that it's modifying my original table. I'll have to look into it..