Sounds like a problem with the "flash".. if they are unregistered the flash doesn't need to load. Try taking this line out of /templates/base/_header.html

<script src="inc/js/ie7_flash_fix.js" type="text/javascript" language="javascript"></script>

Even this line is SUPPOSED to FIX a problem in IE it ends up causing some peoples "widgets" to not load.
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