Hi ya :)
I installed this addon today, uploaded the files:
includes / languages / english / extra_definitions / constant_contact_sidebox_defines.php
includes / modules / sideboxes / constant_contact_sidebox.php
includes / templates / mytemplate / sideboxes / tpl_constant_contact_sidebox.php
Installed the SQL Patch and then added the html code, enabled it, and then turned it on in Layout Boxes Controller.
All the product is now gone. it comes back when I turn this off, but I would like to use it. Any idea's on how to get this to work?