Additional Tags Undo?

I enabled the plugin, and then discovered that it potentially wreaked havoc on blog designs. Consider the same theme now appears different on different blogs:

http://www.lockergnome.com/leftystrat/2009/12/11/you-never-forget-your-first-strat/

is different from...

http://www.lockergnome.com/theoracle/2010/02/09/open-office-3-2-0-finally-arrives/

is different from...

http://www.lockergnome.com/windows/2008/10/09/geeks-guide-to-installing-windows-xp-using-a-usb-flash-drive/

Where would I look to "undo" the plugin's changes? Couldn't seem to find entries in the DB, nor could my administrator. If it only takes the deletion of said plugin, then my problem lies elsewhere (although more difficult to troubleshoot).

Chris