change case type label in front end causes errors when creating a new case

CRM-8051 addresses this issue and suggests that it should be ok to change the label.

However, when I change the label of a case type, I get the following backtrace:

backTrace

/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Core/Error.php, backtrace, 296
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Case/XMLProcessor/Process.php, fatal, 448
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Case/XMLProcessor/Process.php, getMaxInstance, 288
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Case/XMLProcessor/Process.php, isActivityPresent, 407
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Case/XMLProcessor/Process.php, createActivity, 140
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Case/XMLProcessor/Process.php, processStandardTimeline, 116
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Case/XMLProcessor/Process.php, process, 58
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Case/Form/Activity/OpenCase.php, run, 302
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Case/Form/Case.php(394) : eval()'d code, endPostProcess, 1
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Case/Form/Case.php, eval, 394
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Core/Form.php, postProcess, 250
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Core/QuickForm/Action/Upload.php, mainProcess, 153
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Core/QuickForm/Action/Upload.php, realPerform, 130
/var/www/drupal.civicrm.org/svn/civicrm34/packages/HTML/QuickForm/Controller.php, perform, 203
/var/www/drupal.civicrm.org/svn/civicrm34/packages/HTML/QuickForm/Page.php, handle, 103
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Core/Controller.php, handle, 284
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Case/Page/Tab.php, run, 180
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Case/Page/Tab.php, edit, 212
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Core/Invoke.php, run, 223
/var/www/drupal.civicrm.org/svn/civicrm34/drupal/civicrm.module, invoke, 363
, civicrm_invoke,
/var/www/drupal.civicrm.org/public/includes/menu.inc, call_user_func_array, 348
/var/www/drupal.civicrm.org/public/index.php, menu_execute_active_handler, 18

I'm attaching a selenium recording of this happening on the demo site.

jamie