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Two issues:
1. Seems that drag-and-drop is not working in ZCS 6.0. Browser (FF3 on Mac Leopard) has add-on and is working on ZCS 5.0 fine.
2. On both ZCS 5.0 and 6.0, any importing, uploading, drag-and-drop into Briefcase refuses to recognize any file EXCEPT image and PDFs. All general icons for word processor, spreadsheet, presentation, etc., documents produce just a question mark. The mime-types are fixed though.
Bugzilla
Wiki
Source
Briefcase: Drag-and-Drop & file icons 
Linear Mode
