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<blockquote data-quote="DiePlage" data-source="post: 1099300" data-attributes="member: 45460">Hello mm,thank you for your detailed reply!Indeed, your recommendations have helped me a lot. But first, here's details on my network:All Network clients are wired to Cat6 cabling connected to two 19&quot; 24 port manageable Gigabit Switches (HP Procurve 1810G - 24 GE; Netgear GS724T). The two switches are connected by Fiber (Gbic). All ports autonegotiate to 1Gbps, There are VLANs present however all Mediaportal installations reside on the same untagged portgroup. QoS and security settings of the switches look pretty much &quot;off the shelf&quot;. Windows Firewall is disabled for local networks on all MP-installations, there is no AV Software installed.As you suggested I have disabled IPv6 on the server and two clients by using this Microsoft FixIt:<a href="http://support.microsoft.com/kb/929852/en-us" target="_blank">http://support.microsoft.com/kb/929852/en-us</a>Afterwards the IPv6-checkbox in &quot;Properties of LAN Connection&quot; was still checked so I disabled it and rebooted again.I found out that:<ul>
<li data-xf-list-type="ul">Channel switching is MUCH faster after disabling IPv6</li>
<li data-xf-list-type="ul">TvHome.RenderBlackImage still occurred on one seat butI have been able to resolve this. It happens every time when MP is started in windowed mode WHILE dynamic refresh rate changing is enabled in configuration. If dynamic refresh rate changing is disabled OR MP is started in Fullscreen, there is no black screen issue.</li>
</ul>So, the TvHome.RenderBlackImage problem seems solved and channel switching is much faster now.There are still situations in which starting playback on one client causes playback on other clients to stop. However I have not yet been able to reproduce this.Thanks again!Cheers</blockquote>

[QUOTE="DiePlage, post: 1099300, member: 45460"] Hello mm, thank you for your detailed reply! Indeed, your recommendations have helped me a lot. But first, here's details on my network: All Network clients are wired to Cat6 cabling connected to two 19" 24 port manageable Gigabit Switches (HP Procurve 1810G - 24 GE; Netgear GS724T). The two switches are connected by Fiber (Gbic). All ports autonegotiate to 1Gbps, There are VLANs present however all Mediaportal installations reside on the same untagged portgroup. QoS and security settings of the switches look pretty much "off the shelf". Windows Firewall is disabled for local networks on all MP-installations, there is no AV Software installed. As you suggested I have disabled IPv6 on the server and two clients by using this Microsoft FixIt: [url]http://support.microsoft.com/kb/929852/en-us[/url] Afterwards the IPv6-checkbox in "Properties of LAN Connection" was still checked so I disabled it and rebooted again. I found out that: [LIST] [*]Channel switching is MUCH faster after disabling IPv6 [*]TvHome.RenderBlackImage still occurred on one seat butI have been able to resolve this. It happens every time when MP is started in windowed mode WHILE dynamic refresh rate changing is enabled in configuration. If dynamic refresh rate changing is disabled OR MP is started in Fullscreen, there is no black screen issue. [/LIST] So, the TvHome.RenderBlackImage problem seems solved and channel switching is much faster now. There are still situations in which starting playback on one client causes playback on other clients to stop. However I have not yet been able to reproduce this. Thanks again! Cheers [/QUOTE]

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