Based on the above and an independent notification, the problem with the sanitation code was corrected (added too early within the file) as well as an issue/rewrite of a few of the javascript files. Version 2.1.1 will be posted to the forum shortly for review, but is also available from github: https://github.com/mc12345678/zen-colorbox/tree/2.1.1

- Updated installer/updater to exclude operation if the logoff was selected.
- Relocated code that was disabling a properly formatted/named Image Handler 4 image to allow IH4 and
zen colorbox to continue to operate together.
- Completed the incorporation of the code template code to minimize code rewriting/retyping. This also
removed a javascript error that was generated on the checkout_payment page.
- Incorporate ZC 1.5.5 code into the includes/modules/YOUR_TEMPLATE/additional_images.php file including
notifiers and the comments at the top of the file.
- Removed the obsolete language="javascript" parameters from the HTML <script> tags.