Aggregate Devices - any tips appreciated

Can anyone give me some pointers to info on handling aggregate audio devices with L8 + 10.5.1? Keyword and topic searches across the forums don't return anything useful.
This is the setup:
2x MOTU Traveler 22-in/22-out interfaces (counting ADAT, SPDIF + AES/EBU), each running identically w.r. to data rate (48kHz), clocking (normally internal), and FW connects (each to its own PCIe card+bus) into the MacPro.
AudioMIDI Setup is OK w.r. to making the pair into an Aggregate Device, which "sticks around" between sessions/peeks.
However Logic8 (and every other host) does not recognize the aggregate dev and sees only two separate units. This isn't the end of the world, and there are workarounds in the studio (e.g. going to analog audio + sub-mixes). But it puzzles me as to why I can't stay digital + aggregated, and instead have to be limited by the CoreAudio "rule" of "one device for input and/or output".
Previously, under 10.4.x (and for a while under 10.5.0) the setup worked without problems, even when clocked externally.
Any ideas on where to look / how to find out what's going on?
Any advice much appreciated.

Found the answer ... make the aggregate device with root privileges before using.

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