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Imported from Trac ticket #116 reported by patrickmj on 2011-01-06:
TCPDF sometimes throws division by zero errors in different places (tcpdf.php lines 12834 and 19482, probably more)
Example content. http://www.recipe-for-travel.com/travel-links-directory.html
Looks like html forms are related to the error in 19482.
Will need some additional chasing to figure out the other root HTML causes.