Process Simulator not working with 7.1.2 objects in 8.0

We have a process that was generated in 7.1.2 that we imported into 8.0. The import went fine, but when we tried to run the simulator, none of the events were being passed to the next object (from the start).

The events counted fine and were passed to any NEW services we created, but the old objects that were created when the project was in 7.1.2 do not react at all to events despite having stripped them down to match the new services.

This is a pretty severe problem since it would require us to re-generate the entire BPM in 8.0.

This is using webMethods Designer.

Any resolution you got for this issue?