Scanner module triggers call to node.admin.inc (require_once(), trying wrong path)
Turns out to be a conflict with Administration Views (7.x-1.0-alpha1). 

Disable admin views &amp; functionality is restored. Not sure where the blame is yet because I haven't pinpointed the conflict. But it does make sense at face value because admin views replaces the /admin/content and scanner is located at admin/content/scanner