During upgrade, would you not update JAVA too. Customer will stay with 11 year old JRE 1.6 on a new MII 15.
Try the latest version of JRE if that is okay for Customer.
Also try Under control panel -> Java->Security -> Add your site to exception list
On the IE Browser,change document mode settings in browser and test, if that helps.
FYI, We have recently upgraded a customer from MII 12 to 15.
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