View manage case screen gives two PHP Notices:
"Notice: Undefined index: cid in getCaseRoles() (line 253 of /var/www/sitename/sites/all/modules/civicrm/CRM/Activity/Page/AJAX.php"
Watching the Ajax call with Firebug shows that cid is submitted with the request but it must be getting lost.
The submitted request is to:
2) The other which may be related is:
"Notice: Undefined index: actions in encodeDataTableSelector() (line 133 of /var/www/mysite/sites/all/modules/civicrm/CRM/Utils/JSON.php)"