The most common source of that problem, according to few searches on google seem to point to using absolute positioning. This was not an explanation that I found too satisfying, first because I was not about to change my layout, and second because most of the references were at least 3 years old.
So I kept digging, and came accross an other solution from Tom Muck in Fix for IE selection bug. Unfortunately, this did not apply for me.
And finally, I found the most conspicuous post on the drupal site where if you don’t use the form
this will be enough to break internet explorer. Who would have thought! Well, maybe by now I should now better.
And the worst part of that? Well it was the second time in 2 months I needed that, and for the life of me, I could not remember what I had done the first time around. So unless this server crashes too, I’ll know where to find the solution next time.