If you have not already I would suggest contacting your local support contact.
If it is "HTML render is not hooked correctly" there are some environment variables you can use, particularly if you have an old graphics driver, although the symptoms for that you still see something ,just in the wrong scale, so I don't think that is necessarily the issue.
My suspicion is that there maybe something beneath APPDATA (permissions, partial install, corruption that type of thing) and it is a case of deleting a particular directory so that Studio thinks it is being used for the first time after an install.