CiviCRM Case types causing Drupal module install error

Hi

It looks like there is a recently appeared bug, found a few references to this on stack exchange and had the same issue myself.

Issue is that case types enabled in CiviCase are stopping the install of Drupal modules.
When the case type is disabled Drupal modules can then be installed.

The symptoms are described in the stack exchange post.
http://civicrm.stackexchange.com/questions/6320/error-from-civicrm-code-when-i-try-to-install-other-drupal-modules.
Sorry this isn't better described or recreated on demo (lots of CiviCON items left to do).

Oliver