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** This issue is addressed in ArcGIS 9.0 Service Pack 2 (SP2) **
The 'hitElement' argument to the hitTestSelection method of ITopologyGraph is of an incorrect type. Currently, the signature reads that the expected object type for this parameter is to be an ITopologyElement, but it is should be an empty, one-dimensional ITopologyElement array ( ITopologyElement ).
The hitTestSelection method call should to populate this empty array with the results.