Persistent Aggregates bug with logic - anyone else see this ?

A long while ago I posted a bug report regarding the use of aggregates with the Stealthplug guitar audio interface. I also reported this on the apple bug report system.
Basically, when using Logic8 with stealthplug and OSX Tiger ( latest 10.4 ) I configured an aggregate using AudioMIDI setup program, configuring Stealthplug as the input and the built in audio as the output.
When one creates an audio track with the aggregate name selected I Logic8
preferences INITIALLY one can get audio input to show up, the "record" button appears and one can hear audio output to the main macbook audio outputs. However on repeated use and selection/deseletion of the particular named aggregate one finds that the stealthplug input is no longer enabled ( the record button disappears).
I found out recently that if I delete the aggregate ( I only had one aggregate st up ) and create a NEW aggregate, this time with a different name, but with the same settings ( stealthplug as input, built in outputs as output ) then one can get the aggregate to work initially in logic8. However after a few sessions, or switching between audo devices in preferences, the aggregate again fails to work, by this i mean I no longer get the "R" button appearing in the channel strip for the input.
Stealthplug works fine when selected itself if one selects this as the device, but NOT when used through an aggregate. I suspect this is something to to do with aggregates and not stealthplug.
My suspicions is that it has something to do with the way logic8 or the CoreAudio system stores its aggregate preference information since I find that if I delete the original aggregate but recreate the same aggregate settings using a different name then the aggregate will work for a short time.
This really needs fixing since aggregates are potentially so useful.
Anyone else seen this with stealthplug or another audi interface ? is the Aggregates system just plain buggy? dos this problem go away in Leopard ?

Well I can say that after installing updates to QuickTime is appears I have been having a lot of trouble with Aggregate Devices as well. I use 2 896HD MOTU interfaces and after a few sessions of Logic, the Aggregate device stops working. I can either (a) reset the computer, (b) sometimes reset the coreAudio driver (works rarely) or (c) create a new Aggregate device like you have and it all starts working again.
Even worse, some of my USB MIDI interfaces like the Fantom X7 just loose connection as well. If I remove the USB and then plug back in, it's recognized again immediately.
Something is seriously broken and I have NO clue where to begin to help fix it. The only thing I could do is re-install OSX 10.5 and not do the quicktime updates and see if that helps. Unfortunately, that is a LOT of work! (I use like 146 AU plugins total).

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