Why does my YouTube video stall and does not restart unless I manually "Jog" the progress bar?

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Why does my YouTube video stall and does not restart unless I manually "Jog" the progress bar? cmbird 2/15/10 11:53 AM
It seems the video loads the first +/- 1 minute  then stops waiting for next buffer to load.  No matter how long I leave it it never downloads the next bit of video.  When I "Jog" the progress bar it restarts for another 1 minute or when I change the resolution of the video 360p to 480p ...  I have downlaoded the latest Flash Player and checked the settings when YouTube is running, I have noticed s.ytimg.com only uses 2Kb of memory but I have allowed up to 10Mb.

I have a communial Broadband Internet service which is a bit erratic but when tested I can get 2.2Mb downspeed and about 1Mb uplink.

PC is SONY model with 2 GB Ram  Dual Core Processor 200GB HDD.

I have tried only running Youtube and closing all ather applications, even disabled Avast antivirus with no difference.

Any help would be appreciated.