Cannot watch web videos in Mozilla 2.0.0.8

Fri Nov 16 02:31:43 UTC 2007

Running Kubuntu 7.04 on an i586 box with 512 MB RAM.
Have Firefox 2.0.0.8 with flash_player_9_linux from Adobe site installed.
If I try to watch a video clip anywhere (CNN, YouTube, ...), I get this 
message:
"The video timed out attempting to play.
Please ensure that you do not have any Flash Blocking plugins active."

What should I do to correct the situation?
Any help will be thankfully appreciated
jdh
_________________
kubuntu 7.04 on
i586 w/ 512 MB

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