Help? Aggregate devices not working in Lion

Since buying a new Mac Mini Server for my audio work using Logic Pro 9 I cannot use aggregate devices. The system preferences as well as audio midi setup will not remember my aggregate devices that I create. Also when using them the audio becomes glitchy and a terrible noise happens. I didnt have any issues like this in 10.6.8. I cannot believe that Apple would let this happen for so long. There are many people in the pro audio world that rely on using aggregate devices and with them not working three versions into Lion this has become maddening.
This is not a third party issue. This is not a hardware issue. This is a serious problem that takes the saying that "Macs just WORK" and flushes it right down the toilet.
I spoke w a guy named Steve at Apple pro audio and he couldnt get me off the phone fast enough. What the ____ Apple??
PLEASE someone fix this? I wont try 10.7.4 as it seems to make Logic work even worse.
Please...I do not want to have to go back to using pro tools and PC's.

please and thanbk you Eriksimon! Full details - Mac Mini Server running Lion 10.7.3, Logic Pro 9.1.7 I use up to three Metric Halo 2882+DSP 2d units with the latest MIO console, drivers and firmware. Many other Metric Halo and other multiple device users are experiencing this and it is maddening. Ive been on Logic since 7 and am a analog-digital component level tech / electronics engineer / audio engineer with a decent knowledge of software.
I also use up to two McMix (now Avid artist mix) with latest version of Eucontrol as well as V-control pro with my iPad to control Logics transport etc when not in control room and a Novation sl49 compact USB keyboard with latest Automap version All that worked together quite well on 10.6.8 - logic 9.1.5 on my late 2008 Mac Book Pro but that system was slow...so I was hoping that Apple had Lion "in a cage" when I went out to buy this new Mac Mini Server.... I guess I should have waited.
I am having these aggregate device problems on a totally new from Mac Store Mac Mini Server Quad Core i7, did a clean install of Logic and the Metric Halo software /driver /firmware package.
Nothing else installed on this new Mac Mini but Logic 9.1.7 and MIO package.
Please....help get this bug fixed??
Best wishes dindisc2

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