have another problem too. the right border of the datatable is not rendered. Why is this so?
You can check CSS styles applied to any element easily using Firefox Firebug tool.
In FireFox, the border is shown. But in IE the border is not shown.
just can't confirm. added two columns without any components inside and has all the borders between them in IE. using 3.3.1 snapshots and only default styles applied to the table.
B.t.w. if you need to check DOM and css applied in IR - use Developer toolbar tool.