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Previously Port::PortDrop was never handled. The signal was disconnected directly when the connection is re-used by Port::PortSignalDrop. Ports::drop() was not called when the engine was stopped or disconnected, and port-handles were not invalidated. This lead to crashes whenever a port-related operation was performed while the engine was stopped. e.g. adding/removing tracks or plugins (latency recompute, notify port-engine) and various other operations.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html