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<blockquote data-quote="CyberSimian" data-source="post: 1106925" data-attributes="member: 141969">I have looked at this some more, and have come to the conclusion that the problem with these channels may have been caused by a &quot;retune event&quot; that occurred in the UK several weeks ago.&nbsp; As mentioned previously, I have a Humax HDR-FOX-T2 PVR which I keep as an &quot;emergency standby&quot;, in case my HTPC suffers a catastrophic failure.&nbsp; As such, I do not normally use the Humax for recording, so I was happy to retune it as soon as the UK retune-event was completed.&nbsp; I checked today, and most of the channels that you mention above broadcast for 24 hours per day, have full details in the EPG, and can be selected successfully for viewing or listening.Now my understanding of the retune event was that it changed only logical channel numbers (LCNs), and that there is enough indirection in the channel definitions for the renumbered channels still to be found.&nbsp; And indeed, MP can still find the news channels, which moved from LCNs in the 80s to the 130s, and I still have a fully-populated EPG for them.&nbsp; However, I suspect that the channels listed above experienced more significant changes, possibly moving from one MUX to another, such that MP can no longer find them.So, why haven't I retuned my HTPC?&nbsp; I have so far refrained from doing this because of the (to me) unknown impact that it will have on the recording schedule.The reason why I am wary is that with Windows Media Center, retuning has a catastrophic effect on the recording schedule.&nbsp; Windows has a penchant for using GUIDs to reference things, and this includes the channels in WMC, and the recording requests.&nbsp; Each recording request contains the GUID of the channel that it is to tune.&nbsp; When the channels are rescanned, WMC allocates a new set of (unique) GUIDs for the channels, with the result that the recording requests now refer to channels that no longer exist in the channel database.&nbsp; An incremental scan probably does not do this, but then you end up with a lot of dead channel definitions (because they moved somewhere else, but WMC cannot delete them because they might be part-time channels which were not broadcasting when the scan was performed).So, may I ask a supplementary question?&nbsp; If I perform a tuner rescan, what effect does that have on the recording schedule?&nbsp; Is the schedule preserved without error, or is it completely destroyed?&nbsp; Thank you.-- from CyberSimian in the UK</blockquote>

[QUOTE="CyberSimian, post: 1106925, member: 141969"] I have looked at this some more, and have come to the conclusion that the problem with these channels may have been caused by a "retune event" that occurred in the UK several weeks ago. As mentioned previously, I have a Humax HDR-FOX-T2 PVR which I keep as an "emergency standby", in case my HTPC suffers a catastrophic failure. As such, I do not normally use the Humax for recording, so I was happy to retune it as soon as the UK retune-event was completed. I checked today, and most of the channels that you mention above broadcast for 24 hours per day, have full details in the EPG, and can be selected successfully for viewing or listening. Now my understanding of the retune event was that it changed only logical channel numbers (LCNs), and that there is enough indirection in the channel definitions for the renumbered channels still to be found. And indeed, MP can still find the news channels, which moved from LCNs in the 80s to the 130s, and I still have a fully-populated EPG for them. However, I suspect that the channels listed above experienced more significant changes, possibly moving from one MUX to another, such that MP can no longer find them. So, why haven't I retuned my HTPC? I have so far refrained from doing this because of the (to me) unknown impact that it will have on the recording schedule. The reason why I am wary is that with Windows Media Center, retuning has a catastrophic effect on the recording schedule. Windows has a penchant for using GUIDs to reference things, and this includes the channels in WMC, and the recording requests. Each recording request contains the GUID of the channel that it is to tune. When the channels are rescanned, WMC allocates a new set of (unique) GUIDs for the channels, with the result that the recording requests now refer to channels that no longer exist in the channel database. An incremental scan probably does not do this, but then you end up with a lot of dead channel definitions (because they moved somewhere else, but WMC cannot delete them because they might be part-time channels which were not broadcasting when the scan was performed). So, may I ask a supplementary question? If I perform a tuner rescan, what effect does that have on the recording schedule? Is the schedule preserved without error, or is it completely destroyed? Thank you. -- from CyberSimian in the UK [/QUOTE]

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