Hopefully now all calls to escape() are replaced with ajaxEscape() in response to Tomasz's forum post; remove deprecated version of show_category_info() from functions.php
.mceItemFlash {
border: 1px dotted #cc0000;
background-image: url('../images/flash.gif');
background-position: center;
background-repeat: no-repeat;
background-color: #ffffcc;
}