After upgrading iTunes on my mac, iTunes won't open.

The other day I upgraded my iTunes to the latest version. Now, I cannot open my iTunes at all. The icon for iTunes shows up for a second then disappears. It would be nice to listen to all the music I bought.. The last time I updated iTunes it crashed my computer everytime I opened it. I think it's a ruse to get people to pay for customer support... Anyways, please help!

Re-download iTunes from the apple website, install it and restart then it should work.

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Step 1
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
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Thanks for the question. I understand that your iPod nano is not recognized in iTunes after updating. The following troubleshooting articles may provide a resolution based on your symptoms:
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After placing aperture.app to the trash can and putting it back to programs again,
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Just for the record:
To remove the preferences:
The Preferences are in your User Library, Preferences folder:
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defaults write com.apple.iTunes file-buffer-size 512000
defaults write com.apple.iTunes stream-buffer-size 512000
No luck. I still get stutters and skips.
To compound the matter, I have an iPod running iOS 6.1.3 (M540LL/A) with Tunein Radio installed that I use to stream internet radio to the same AE/stereo with no problems, so I know the modem/router feed is good and that the network is functioning properly.
Strangely, I have read no other posts of this problem cropping up after upgrading so it may be a setting on my system that is causing the problem.
Any suggestions?

I have what sounds like a very similar issue.
I had my Denon 3312ci working perfectly with Airplay from my 2013 iMac running iTunes. Upgraded to iTunes 11.1.3, and now when I attempt to Airplay direct from iTunes to the 3312, it plays for about half a second and then stops. Displayed on the Amp then says "Assigning Network". The amp starts dropping ping packets at this point. About 15-20 seconds later the pings start coming back, but no Airplay.
I tried different network cables, resetting the microprocessor, a different switch, changing between DHCP and static IP. Was about to make a warranty call to Denon, when I thought maybe I should try Airplaying directly from iphone and ipad. Much to my surprise, it worked from those devices.
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My network set up is fine. I can use internet radio and connect to DLNA services fine on the amp. It is just airplay between iTunes 11.1.3 and the amp where the issue lies.
No fixes as yet, but I have logged a support call with Denon Australia to see what they say.

After upgrading iTunes on my mac, iTunes won't open.

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