Without knowing exactly what the MAC L4 Developer's Testing Environment consists of - coming from a former Software and Network Engineering Background - have you considered have a couple of pristine - right-out-of-the-box MAC machines running Leopard and Snow Leopard that could be used for the best-case scenarios? The reason I ask is - I am running a fairly pristine New MacBook Pro with Snow Leopard and most of the reported problems that I read about everyday - I am not experiencing on my machine. With all of the free custom applications and Dashboard applications that people tend to download and run on their MAC's that occupy system resources - I'm wondering if those individual, system-specific applications are contributing to at least some of the problems being reported. It would be curious to know that if the testing system is un-customized - does L4 run more stable? My experience has seemed to indicate that. Another thing to consider - do the errors depend on which level product you are running - in other words do the problems occur more frequently depending on the volume of resources you have in your library? Is there any relationship. It might be helpful to report problems along with a profile of the machine that is running the L4 Software???
Anyway - just my humble opinion.
-Mike