Forum Moderators: not2easy
When the window is resized, the tiniest nudge (increasing OR decreasing window size) can force the right columns to the left (under left column); the tiniest change (again, bigger or smaller) can make it revert to its proper position...
I've got a feeling there's something small I'm missing...!
It's a very fragile kind of layout, but if you experiment with making the column widths add up to a little less that 100% (i.e. 33%, 33.9%, 33%) it can make it more stable in IE.