Odd Sound Behavior After 10.6.2 Update

I've had a few odd sound issues since updating to 10.6.2:
1) Volume is set at 50% after some reboots (I normally have it set at 12.5%). This has happened about 1/2 the time after reboots (which have unfortunately been much more often in 10.6).
2) While iTunes is playing the sound stops and the sound icon in the menu bar greys out. iTunes keeps 'playing' but I don't get any sound. This lasts for 5 - 10 seconds and happens a few times an hour but without any predictability.
It may happen at times that iTunes isn't playing and I just don't notice it. It has happened while the system as announcing the time as well. This may be the cause of sound issue #3 but I haven't caught the sound icon in a 'grey state' when the notification sounds don't play yet.
When the sound icon is grey I get the beach ball and Safari doesn't respond (standard 'Application not responding' message). Other apps seem to work while this is happening (Finder, System Prefs - including sound panel, FireFox, etc).
3) Some expected sounds used for feedback in Finder & Mail don't always work. This is very intermittent and may be happening more often then I notice these are notification sounds and I don't realize that I've missed them. I don't know if it's associated to the sound failure mentioned in #2.
~
I've also had some other odd behavior:
* System won't wakeup from sleep (not always but often enough to require several reboots in the last week).
* Safari just eats up RAM.
* Safari has locked up for no apparent reason (no clue as to what sets it off).
* Safari has locked up while using a Java applet. This only happens on occasion but always happens when launching a GoToMyPC session (GTMPC works fine in FireFox, even while Safari is locked up). This is separate from the Safari issue noted above.
I'm using 10.6.2 w/ Safari 4.0.4 & iTunes 9.0.2 (Flash not installed)
James

You could try [these grey sceen, etc., troubleshooting steps|http://support.apple.com/kb/TS2570] ignoring any duplicaion of what you already have don. And, you could try [these general troubleshooting steps|http://support.apple.com/kb/TS1394] again ignoring duplication.
If all above fails, then I suggest you do a repair install of Sno by installing Sno over Sno as in an upgrade install. Such an install, while usually very safe, still is an install so be appropriated backed up if you proceed.

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