We have other users reporting this problem in older versions of Internet explorer too. Basically when they arrive on the page and select an avatar the avatar is not visibly "selected". However, it does seem to be selected partially behind the scense because when the form is submitted the user gets an error similar to the one below:

The specified file public://avatar_selection/hat-girl.png could not be copied, because the destination directory is not properly configured. This may be caused by a problem with file or directory permissions. More information is available in the system log.

Note that if we go to the same form and submit without attempting to select an avatar there is not an error. Any help/suggestions would be greatly appreciated. Thank you in advance.