IE8 has an adblocker built in. It is called InPrivate Filtering (not to be confused with InPrivate browsing a.k.a. porn mode). I have InPrivate Filtering on by default, and it did not interfere with SO before.
Recently, something changed, and I cannot do anything until I switch InPrivate Filtering off. I guess there was a change in SO script or a new ad arrived. Anybody else experiencing this? Any ideas how to fix it? Is it (should it be) a concern for SO developers?