I'm running Sage 6.4.1 on OS X (Yosemite).  Creating a finite, connected 
DAG with n vertices (for any n that I tried) returned +Infinity.  EG:

sage: digraphs.Path(10).diameter()
+Infinity

or even

sage: digraphs.ButterflyGraph(5).diameter()
+Infinity

However, both of these Path and Butterfly graphs are finite, connected, 
directed acyclic graphs so their diameter should always be finite.  I need 
to be able to compute the largest diameter of the connected components of 
any finite DAG, yet the diameter method fails even on these simple cases.

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