Script crashes in IE 9.0.12

As a follow up, is there any way to change the autocomplete user selection field to a dropdown list or require user to simply type in the recipient name?

Another update. Tried converting the message form into a "Renderable element" using the Renderable elements module with Display Suite. This little module is a very interesting addition to Drupal. I have found it to generally be very stable, but you really need to test the behavior of any form you convert using it.

In any case, it seems to solve the problem of the slow script when writing a private message in IE 9. I converted the form using Renderable elements. I am still not able to get the "To:" field to autocomplete the user name, but I type in the complete user name(s), at least it works.

Once again, the private message module is amazing. I hope it or some other replacement can be made completely fieldable, allowing the end user to do things like can the display of the "To:" field directly.

Tested the patch in http://drupal.org/node/1956038 and it seems to work, can now use autocomplete in IE and no slow script problem.