Disappearing Dock, App Switcher then CRASH!

Dock stops responding and can't apple-tab between apps. Finder responds but is VERY slow. Open applications work just fine... if you can get to them!!
Logout, restart or shut down from the Finder menu causes a complete CRASH.
Experienced user. Have run all the normal diagnostics - cleared caches, plist files, etc etc...
There seems to be similar postings here... any experts got better ideas on what might be the problem here?
Looking forward to some technical replies...
Cheers.

I'm confronting a similar problem.
The cursor won't activate the dock and the function keys stop functioning. You can still navigate around the desktop, but it gets sluggish. If you try to log out or restart it crashes.
I trashed the dock preference as one reader suggested. Stop working again in less than 2 hours.
Only thing I've done is do a security update before this started happening. Could it be the latest security update.
This whole thing reminds me of a virus attack.

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