This error is related to Internet Explorer. Internet Explorer has known issues with websites such as TeamUnify in as far as editing, adding accounts etc. Not for Not an Admin users. It causes slowdowns, editing freezes and stack 26 errors.

Please go to www.mozilla.com and download the Firefox Browser. Use this browser exclusively while working within TU. They have surpassed IE in there ability to handle the programming language that we write in and they are much faster.