coldfusion.image.ImageWriter$ImageWritingException: An exception occured while trying to write the image.

One of two things, either the patch was not applied\incorrectly applied, seen here:

http://www.bennadel.com/blog/1289-ColdFusion-8-0-1-Bug-Coldfusion-Image-ImageWriter-ImageWritingException.htm

with CF stopped

or the path is wrong in the code, per our example:

http://www.hosting.com/support/cfusion/captcha/

destination=”tmp/readme#tc#.png”

being run from example.com/subfolder

would result int he file trying to be written to:

C:\Websites\userdir\subfolder\tmp\