Error on deleting a custom content pane from the ctools interface

Drupal 6.17
Panels 6.x-3.7
ctools 6.x-1.7

With the ctools "Custom Content Pane" module installed you can create reusable custom content panes, which is great. However if you try to delete a custom content pane on the admin/build/ctools-content page, you get the following error:

user warning: Table 'drupal6.ctools_custom_content' doesn't exist query: DELETE FROM ctools_custom_content WHERE name = 'social_networking' in /home2/globanf0/public_html/drupal6/sites/all/modules/ctools/includes/export.inc on line 189.

It looks like whatever query this is running is missing the prefix for the table (in this case i've set the prefix to d6_ ) ?