When inserting custom-tags, the following error shows up in var/error.log:

[ Dec 10 2008 12:41:17 ] [131.203.7.37] eZTemplate @ extension/ezoe/design/standard/templates/ezoe/customattributes.tpl:37[4]:
Unknown template variable 'custom_attributes' in namespace ''
[ Dec 10 2008 12:41:17 ] [131.203.7.37] eZTemplate:foreach @ extension/ezoe/design/standard/templates/ezoe/customattributes.tpl:37[4]:
Missing/malformed array to iterate through.

...

[ Dec 10 2008 09:57:23 ] [131.203.7.37] eZTemplate @ extension/ezoe/design/standard/templates/ezoe/customattributes/text.tpl:1[221]:
Unknown template variable 'custom_attribute_title' in namespace ''

I do have some of my own custom-tags defined in ezpublish/settings/override/content.ini.append.php but removing these and repeating didn't change the log output,

Steps to reproduce

1: #> tail -f var/log/error.log
2: Select an Article for editing
3: Select the custom-tag inset button form the editor's toolbar
4: Review output from error log