Logic & Mainstage Crash On Leopard 10.5.2

Question

I have discussed with many Leopard user lately...
This is what I heard from them
1. with 10.5.1 and Mainstage 1.0.2 I had a pretty **** solid setup, since the 10.5.2 update I'm getting crazy cpu spikes all over the place and its basically feeling a lot less reliable. My advice, if you're using Mainstage for gigging, hold of on the osx update, I'm prob gonna have to roll back. You'd think Apple would test this sorta thing especially on their own programs!
2. When I ran Logic on my PowerBook under Leopard it would frequently crash, have errors, CoreAudio Failures, complete drop outs, hangs, zombies.. you name it.. all of which were resolved by re-installing tiger..
Thus I have two partitions on the PowerBook now, Tiger and Leopard, Tiger is a base install with nothing on that I don't need for Sound, and Leopard is my playhouse for all other things.. ***** to have to reboot but it gives you an air of confidence when you're recording that mdsworker (Spotlight) won't suddenly decide to have an episode and eat all your cpu cycles like it does in Leopard.
3. I've read that AirPort screws up the CPU. Can you disable AirPort and test again?
4. Not only 10.5.2 but all of leopard, I gave up stripped everything of my mac book pro and reinstalled Tiger, Logic and Mainstage. It took 4 hours to do but I at least stable now
I'm surprised Apple is doing nothing but making the problem worse. I've had an Apple computer in one form or another since 1980 and this is the first time I feel really let down.
They are turning into what Steve Jobs called Microsoft
"A third rate software company"
5. How is Mainstage with Tiger then? I found it was pretty stable under Leopard 10.5.1 so may just roll back to that but have been considering going all the way back to Tiger though. Leopard as a whole seems pretty stable now but its like they're not too fussed about Mainstage users, the 1 program that needs 100% reliability.
6. It's much more stable under Tiger no dropouts or problems I won't update to Leopard until I'm sure that it will work
7. Well, I still use Tiger and since the last Airport update neither Logic nor Mainstage work properly until I swtch off Airport. Before this update I had no problems WHATSOEVER with Airport and Logic running at the same time.

Answer 1

A lot of the comments in your post were mine and I have an update!
I attended a Mainstage demo and my local apple dealers store and was such a pain in the *** that the apple rep & the guy who owns the store pulled me aside and asked me what they could do to I guess basically stop me from messing their demo (this was at the point they were stress testing Mainstage on a mac book pro without any CPU problems at all.
So the next day I took my mac in and the service tech did a full diagnostic on my mac, replaced a bunch of ram (it was apple ram not 3rd party) with new memory all for free!!!
In addition the service rep contacted apple Logic support to see what's being done and they advised that they are aware of the problems and there will be a fix in the next update.
Anyway the new ram has helped a bit I still get the occasion pop and crash but I can at least play a gig without watching the CPU meter all night,
The moral of the story is if you have problem, find a demo and be a pain in the butt. It really works
JN