I have that occur fairly often. Sometimes when I click on an embedded video in a blog it will happen, then if I go to the actual YouTube site it will download. Other times it plays for 2 seconds with no sound then stops. Changing from Firefox to Opera always seems to solve the problem. Though it can also happen in Opera, and is fixed by using Firefox. BTW have you downloaded Opera 9 beta 5? If so, what do you think?

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T W Hopper
Member, Presbyterian Reformed Church
Currently between churches since PRC closed here - attending Crossroads Christian Church.
Canberra, Australia.