Dock icons STILL keep disappearing.

There is a thread here that says 'SOLVED' but it was not solved for many people posting on that thread. Here is the URL for it:
http://discussions.apple.com/thread.jspa?messageID=7855781&#7855781
So, I have begun this new thread with the same topic. My dock icon (mail) keeps disappearing. It slides to the right then disappears. Moving the plist dock and db to the trash then rebooting does not fix this problem for me, nor many others on the initial thread. The problem is not specific to the 'mail' icon, other icons are affected as well.
My mail icon is a big deal, please help.

I have three macs that I use every day. I am so annoyed that I can't make any changes to the Dock icons on any of them, and I am sure it has something to do with MobileMe. I have turned off syncing the Dock but it still won't let me make any changes. I have tried the methods people have mentioned in various threads but none of it works.
When I make a change to the Dock, I am doing it for a reason. For Apple to have implemented code that would under any circumstances undo the change that I have made is ridiculous. Everything else about Leopard is great, but this is really, really frustrating and messing up my work groove.

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You're only supposed to drag icons out of the Dock if you want to remove them from it; running applications won't disappear immediately but may do so when quit.
If you're trying to put icons on the desktop, find the items in the Finder and drag them there with the Option and Command keys held down.
(88931)

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Hi,
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Hello there BradTheAce,
It sounds like your Airplay function is intermitent on iOS 8. I would use these troubleshooting steps from the following article to help troubleshoot the issue:
iOS: Troubleshooting Wi-Fi networks and connections
Restart your iOS device.
Tap Settings > Wi-Fi and locate the Wi-Fi network to which you're connected.
Tap and Forget this Network.
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Turn your Wi-Fi router off and on2. If your ISP also provides cable or phone service, check with them before attempting this step to avoid interruption of service.
Update your device to the latest version of software.
Update your Wi-Fi router to the latest firmware2. For AirPort Base Stations, install updates using the AirPort Utility.
Reset network settings by tapping Settings > General > Reset > Reset Network Settings. Note: This will reset all network settings including
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recently used Bluetooth accessories
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Thank you for using Apple Support Communities.
Take care,
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I have the problem that sometimes after undocking my X220 Tablet from 2 different UltraBases, the Undocked System Tray Icon does not disappear.
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divB

Since you are still under the Apple warranty, please give Apple tech support a call (before your 90 day phone support expires, if you did not buy the APP yet...) If the problem is more than just a simple software glitch, they will be able to fix it right away for you...
The tech support hotline is open 24x7:
USA: 1-800-APL-CARE (1-800-275-2273)
Canada: 1-800-263-3394
World: http://www.apple.com/support/contact/phone_contacts.html

Dock icons STILL keep disappearing.

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