System sound (like when empty trash) miserably stop working in Lion 10.7.2

I have upgraded to Lion10.7.2 on my Macbook Pro early 2008 Intel 15 inches, and the update went fine except one annoying problem I found so far.
This problem also occurred in 10.7.0 and 10.7.1 and it seems that no fix has been made in 10.7.2
The problem is when I drag file to Trash and empty it, there should be trash empty sound effect, and this has been with us since Tiger.
In 10.7.2 it work as expected, but when I close the lid to get it to sleep, once I open the lid, the system sound is gone without no reason.
When I play music from iTunes, or when I change volume level, the sound effects work as usual, but empty trash sound stop working miserable.
I have to shut down, press Option-Command-P-R and power on to reset PRAM then system sound like empty trash come back. Again, afpr may be half a day, it's gone again
Any friend here has solution for this? The com.apple.soundprefs.plist file, if you delete it, in Lion, it is not recreated again, and it's gone forever. SO delete plist file is not a solution.
Help please

I found a workaround to my problem accidentally.
As the system sound like empty trash or file drag sound stop working miserably, after close the MBP lid to sleep, after it awake, system sound just stop working.
Before this, I have to shut down my MBP, reset PRAM by press Option-Control-P-R and power on, to get the system sound back
But I found that the workaround whenever the system sound stop working thad do not require reboot is:
1. Go to System Preference-Sound
2. Change Play sound effects through: Internal Speakers to Soundflower 2ch) in the drop down list.
    (Soundflower has been installed by a software called iShowU HD (screen capturing software))
3. Slide to change Alert Volume from the original position
4. Switch back to Internal Speakers from Soundflower 92ch) in the drop down list
5. Change Alert Volume by moving slide bar back to the desirable position
Immediately, the sound effects that stop working will start working again.
This just work for my case. I don't know it will work for ther people that have the same problem as me or not.
And if possible, can some expert here give me explanation why doing the above make system sound effect to work again? mI want to know the cause, and definite solution to the problem
Advise and suggestion please. Thank in advance

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