Case Detail 'Active Role?' filter excludes cases without relationships
The 'Active Role?' filter in the Case Detail report checks the status of relationships.
The current implementation of the filter as a simple boolean requires relationships to exist, and therefore excludes cases without relationships whether the setting is Yes or No.
Problem also reported here: https://civicrm.stackexchange.com/questions/28836/case-details-report-active-case-role-filter