John Harrison of Symantec, reports that they have isolated the cause of the previously reported conflict between CrashGuard and StuffIt's True Finder Integration. It was more complex than it seemed at first, ultimately involving two other extensions. John writes:
"If you have StuffIt's True Finder Integration, Norton CrashGuard's (System Exception plug-in), RAM Doubler 2.0.1, and File Sharing turned on prior to starting the machine, you will be unable to view StuffIt archives in the Finder; the StuffIt application will be launched instead.
Note: This only happens if File Sharing is turned on prior to starting up the machine. If you simply turn on File Sharing *after* the machine has booted, you have no problems whatsoever. Also, if you boot with File Sharing turned on and then turn it off you will still have the problem of not being able to view StuffIt archives in the Finder.
We are currently looking into this issue to see if it is actually a Norton CrashGuard problem or if something else is at fault. Regardless, the most effective work around is to turn File Sharing on after starting the machine."