Unfortunately XP users are stuck with IE8 and Vista user like me with IE9.
For IE10 you need to have Windows 7 or 8.
Microsoft commercial strategy to make users buying upgrades.
The solution is to drop IE on those systems and use modern up-to-date browsers like Chrome, Firefox or Opera.
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Update 2013-09-07 Popper:
This should have been fixed by the developers yesterday evening, at least for IE9. If someone can confirm for IE8 and less?