[FIXED]Payment block issue in IE after upgrade to 4.2.6

[CityClub]

After being upgraded to 4.2.6, the section of contribution pages (event, membership, donation) where a user would enter their credit card info is not showing up in IE versions older than 10. I originally posted in CiviEvent forum (http://forum.civicrm.org/index.php/topic,27054.0.html) but thought this might be a good place to get advice as well.

In IE we get this error:

Code: [Select]

SCRIPT87: Invalid argument.
jquery.jstree.js?0, line 72 character 7
That part of the code seems fine though. Would that be causing this issue anyway or is there something else from the upgrade that might be causing it? We're pretty stumped at this point so any thoughts on it or even thoughts on what to do if we can't figure it out would be helpful.

Thanks.