when streaming starts the system is still responding, but no image transfer will occur. Firewire has got two different communication channels: isochronous and asynchronous. Isoch. is for data transfer and asynch usually for serial communication. Thus asynch. is used for command control and isoch for image transfer.
This behaviour occurs with 494 and older ones.
INF is current.
We've tested with our own manufactured camera, which is in production since 2004. There are no known issues with our current firmware.
We've also tested a SONY DFW-V500 with the same negative result.
The data streaming has been verified by using FireSpy. Cameras are streaming the image data, but no image arrives at the driver.