10.8.1 won't shut down, grey screen

Fresh clean install on 2009 Nehalem Mac Pro with upgraded Kingston SSD drive.  Everything was working flawlessly for 3 weeks. 
1) Shut Down Dialogue
2) Desktop disappears
3) Computer hangs in a light grey screen, remain powered on.  Mouse movements accepted.
I ran Cache Cleaner, repaired permissions... problem persists.  Any help much appreciated.

Try downloading the Trim enabler app - (google OSX trim Enabler) and enable TRIM - by default and for some ridiculous reason that I cant figure, Apple dont support Trim on any after-market SSD - however if your drive is Trim capable having trim switched off can indeed result in some strange delays and hangs. It will also shorten the life of your SSD.
When ever you update OSX - you need to re-enable trim as the enabler works by patching a file. This is also how I know that the symptom you decribe is probably trim related - because I had this exact symptom when I upgraded to 10.8.1 and lost the trim patch that I had orginally loaded in 10.8.0

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    Cheers
    Toby

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