Yes, rov1100, something in the code was changed - but not the AB code! Otherwise it wouldn't be affecting so many other sites ...
The fault lies with Internet Explorer and/or an Internet Explorer plugin and/or your anti-virus software and the way it interacts with Internet Explorer. So you're right, one of the companies that produces whatever software is broken needs to fix it.
In the meantime, you could use a different browser. Or you could (if you're on IE8) click the little dropdown arrow next to the back button and select the fourth one on the list, the one that isn't labelled "Advertisement" ...