Symptoms: flash works but YouTube videos not load.

You probably use some ad blocker like AdBlock for Firefox or AdSweep for Chromium. If you are – they are your problem. Unfortunately only solution I have already found is to disable that extensions. YouTube will just start working again.
Hope it helps.

Solution found here: http://www.linuxforums.org/forum/redhat-fedora-linux-help/103254-youtube-not-working-fedora-7-a.html#post507361

Update:
For Firefox you can try this: http://kb.mozillazine.org/Flash#Adblock_conflict

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If you have error like above and gnome tries to open your location (shortcut in places or bookmarks) with some application other then nautlius try this:

• Open a file ~/.local/share/applications/mimeapps.list in your favorite editor.
• Find line started with “inode/directory” and comment it with #. Save file.
• Check if issue still occure – if not you are done! :-)

Solution found here: https://bugzilla.redhat.com/show_bug.cgi?id=473320#c6

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/etc/hosts:

127.0.0.1	pong

console:

empathon@aden ~ $ ping pong
PING pong (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.079 ms
64 bytes from localhost (127.0.0.1): icmp_seq=2 ttl=64 time=0.074 ms
...

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( i teraz będzie, że zajęło mi tydzień dojście do siebie po sylwestrze )

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