This is in the "Product Suggestions" category since there is no better place to report a bug that I could find.

In Maple 14 using the GraphTheory package on isomorphic (but not identical) transitive 3-regular graphs of order 120,

  IsIsomorphic(G1,G2) hangs.  It seems to do okay if the graphs are not isomorphic (returns false), or if they are identical

  in their labeling (returns true).

A suggestion to fix it would be to use "nauty" by B. D. McKay as the isomorphism engine. 

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