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I cannot reproduce your error, i got (on sage-5.9-beta5):

sage: chain.differential()
{0: 0 x 64 dense matrix over Integer Ring,
 1: 64 x 144 sparse matrix over Integer Ring}

I cannot reproduce your error, error from the command line, i got (on sage-5.9-beta5):

sage: chain.differential()
{0: 0 x 64 dense matrix over Integer Ring,
 1: 64 x 144 sparse matrix over Integer Ring}

I cannot reproduce your error from the command line, i got (on sage-5.9-beta5):

sage: chain.differential()
{0: 0 x 64 dense matrix over Integer Ring,
 1: 64 x 144 sparse matrix over Integer Ring}

I cannot reproduce your error from the command line, i got (on sage-5.9-beta5):

sage: chain.differential()
{0: 0 x 64 dense matrix over Integer Ring,
 1: 64 x 144 sparse matrix over Integer Ring}

Could you try again from However i can reproduce it on the command line instead of notebook. It seems that there is a bug in the notebook ?preventing it to print the result correctly.