Problems with establishing daisy chain, FW800

Hi there!
I am experiencing some weird problems when trying to daisy chain two or more drives with FW800.
It was working fine until yesterday, when suddenly the second drive in the chain wouldn't show up in finder. Also, connecting/disconnecting the cable from the second drive caused the first drive to be disconnected.
So using one drive works fine, but connecting another in a daisy chain does nothing except occasionally disconnect the first drive.
I was running a daisy chain with three drives yesterday with no problems.
I have tried swapping cables, rebooting the drives and the Macbook Pro, and using different combinations of the harddrives - no change.
Seems to me that the source of the trouble is the Macbook Pro. It could possibly be a hardware issue, but I find it weird that a single drive on FW800 works fine...
Anybody got any ideas?
- MacBook Pro (late 2008), Snow Leo (10.6.4), 2x Lacie d2 Quadra

The problem is that this could be tough to troubleshoot if it is a power supply, as the offending drive will attempt to pull the juice it needs to keep running from the FireWire bus.

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Each one mounts individually when connected to the Mini FW800 port but when I daisy-chain them the second one in the chain doesn't mount and is not seen by disk utility.
Those enclosures use an Oxford UF934DSB chipset.
What's ironic that I had a FW400 enclosure daisy chained to one FW800 enclosure until this afternoon and that daisy-chain worked fine.
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I don't think it has anything to do with the power supply.
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