Chris/Herb
FWIW the standalone Vienna Ensemble displays none of these issues - I worked with it using the same VE session all day yesterday (including 5 instances of Altiverb 6) and saw no issuees of stability, so the crashes certainly seem to be specific to the plugin format, perhaps exclusively an issue with Logic.
However, there are some strange memory overhead anomolies. My Vienna Ensemble setup uses 1086 MB of samples, but shows memory usage of 1.9GB. Even allowing for a few instances of Altiverb, it seems like alot of additional memory is being used by VE compared to other hosts.
Let me know if I can provide additional information.
Jules
Intel Mac Pro (8 Core - 3GHz), 8GB Ram, Logic Pro 7.2.3, OS 10.4.11