We found that similar errors are thrown in VMWare Studio itself where we build appliances.
We tested it both on VMWare Studio 2.1 (184.108.40.2068) and 2.6 (220.127.116.11)
IE10 version is 10.0.9200.16384
How can we fix this/is there some workaround for already existing VMs where we or our customers do not want to upgrade VMWare Studio?
Did you ever find a workaround for this? I am seeing the same issue with IE10 (IE11 works). I know you can use IE10 in IE7 mode, but that does not render the pages correctly.