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If you have the later versions of Real Player, here's the settings that work for us...
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DETAILS
General:

home clip=blank

recent clips= 8

start center=blank

Upgrade: Media types = click on re-associate then check in Always play realNetworks Media with RealPlayer
Connection:

normal bandwidth= 56k modem

Maximum bandwidth= T1/LAN

Buffered play= dot by buffer at least 5 seconds before.....

Network time-out setings:

Conncection time-out=30 sec.

Server time-out=120 seconds

Transport:

Network transport= dot by automatically select best

UDP port= no dot

Proxy:

PNA and RTSP Options= no dots

HTTP Options= dot by NO HTTP Proxy

Performance:

Playback=best quality

Clip cache=blank in "enable caching"

Playback from Web links=options: check by enable instant playback and dot by PLAY Sound card compatibility=no checks by anything

Video card compatibility=check by optimized video display