No longer outputs video down FW, when using FW external HD?

In a recent upgrade (I think it was actually when I went to OSX 10.4.6 - although it might have been QT 7.1.1 or even FCS 5.1.1) I have noticed that:
- when using an external FW800 HD drive for captured footage, and trying to play out DV to my ADVC-100 (on a FW400 bus)
- my dual G4 no longer plays DV out of FW for more than a few seconds. The FW video output just stops.
The fact that it plays for a few seconds obviously shows it is all connected up and working OK.
If I take the HD out of the external FW case and put it inside the G4 (on an IDE bus) - all is fine - DV plays out of FW indefinitely. It also used to work previously (before a software upgrade) - playing DV down FW400 while using external FW800 drives for captured footage.
Familiar to anybody else? Any solutions?
I am (I believe) all up to date with updates, including ProAppSupport.

Answering my own question here:
Solution was to use an additional FW PCI card (Sonnet Allegro) to give me a second FW bus in my Dual G4 1.42GHz FW800.
I (wrongly) assumed that with a G4 FW800, with two FW400 ports and one FW800 port, that the FW800 and FW400 busses were separate. Not so, as someone pointed out, saying there are NO Macs with more than one FW bus built in.
So, external HD on internal FW800 bus, and ADVC-100 on PCI FW400 card - and all is OK now.
Can I give myself "solved" points?

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