I'm running litespeed on two servers, identical hardware, Sunfire X4100M2 I think. One version of litespeed is the enterprise version, the other is the standard version. Solaris 10 is the operating system for both. When I use the upgrade feature, the standard version always works as expected. It upgrades and restarts itself, no issue. The enterprise version never works. It upgrades itself. It works for a few seconds and then dumps core. This has happened at least 3 times, and every time I've used the upgrade. My solution is to upgrade and to immediately disable litespeed via the SMF. With 3.3.6 it dumped core before I could disable it. When I enable it again, runs nominally. These environments are as about as identical as you can get -- the same version of solaris, the same sun hardware, other software configurations are similar. It's something specific to the enterprise version causing the core dump.