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see issue 153384. 1. In project "Issues2", insert a class 'SomeClass". 2. In project "Issues", insert a Class Diagram 1 on which you put an interface "MyInterface". 3. Drag "SomeClass" from project "Issues2" to Class Diagram 1 of "Issues" (gets shown as imported from Issues2). 4. Draw an Implementation arrow from "SomeClass" to "MyInterface". Can't add cyclic references dialog appears, and blcok implementation link creation. Also have to change tool in toolbar to select (even it's selected) to unfreeze scene.
may not be enough time in 6.7