First: I recently upgraded from R5A16 to R5C7, and as far vas I can tell, everything is working. I can view TV, I can record, and view recordings.
However, I was looking at the backend logs (in Mythweb) when I noticed something strange: whenever a log line mentions a channel, it uses a four digit channel number. Examples:

Before the upgrade, it used to say 'channel SE14', 'E8' and so on.
Is this a sign of some problem? If so, how do I fix it?

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Torfinn

that is most likely the chanid value from table channel....basically 1081 is channel 81 on source 1.

If you look at table channel you will see

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R5F1 - Dell P4 2.4Ghz 500MB - PVR250 x 2 - GeForce FX 5200 - Onboard sound/NIC 80GB ATA/250GB ATA/400GB SATA