Getting calls and meetings related to a contact using the REST api

I'm trying to retrieve calls and meetings related to a contact in SugarCRM 7.7.0.0

This used to work in SugarCRM 7.6.1.0, but I get no more results in the latest version.

GET https://sugarserver/rest/v10/Contacts/f0eded13-0a6e-03d9-59af-571f6b345996/link/calls

GET https://sugarserver/rest/v10/Contacts/f0eded13-0a6e-03d9-59af-571f6b345996/link/meetings

return 0 results, though the contact has both a call and a  meeting assigned

Has this behavior changed?