Os x lion hangs during shutdown

System hangs showing white screen with status wheel.  I have to power cycle the box to get it going again.  I just upgraded to Lion before this occured.

I had the same rpoblem since installing 10.7 - and 10.7.1 fixed nothing.
i rang Applecare but the guy seemed unconcerned (i had other more pressing Wifi Problems he did solve by getting rid of my Airport network and building a new one)..
So I deliberately quit all apps and shutdown hard, then examined the console on restart (I had previously repaired permissions, zapped the PRAM and reset the SMC anyway for the Wifi issue....so it should have been a clean system.
Lo and behold, I found a reference in the console log to an SD card I had left plugged into my iMac.
So I ejected the SD card, and did a restart to test...and Hey presto- it worked like magic!
I hoep this helps you guys.
Now for the remaining mystery - rearranged desktop icons on startup...i.e. some but not all, and not always....Apple should be doing this debugging not me!

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    Thank you for your response, i haven't been able to replicate the fault again on the mid 2011 iMacs but i have had the problem on a number of mid 2007 iMacs. Please find attached log.
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  • Lion hangs on shutdown "unmount of /net failed (45)"

    Hi,
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    Step #11 - permissions repaired - still problematic
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    Step #15 - there isn't any third party software on my wife's macbook air that isn't running on my own macbook air and macbook pro (both of which are not facing this problem).  I tried to uninstall and reinstall iTunes prior to getting your advice (this is a PITA, by the way!!!!), and had ended up with 10.6.0 installed (since the downloadable installer from Apple at the moment isn't the latest 10.6.1 version), and software update not recognizing the need to update, which is when I went ahead and reinstalled OSX. This did not clear the problem.
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