Sorry, too late,8 hours without electricity.renault: can you please provide the MediaPortal.log as well?
In the latest logs, there appears to be a huge jump (+6 minutes) in the measured timeshift file duration a few seconds after start of play. This is what causes the seeking to fail because TsReader.ax is being asked to seek (by MP TV player) to a part of the file which doesn't actually exist (as far as I can tell from the logs).
TsReader.ax works out the duration by finding/using the start and end file PCR values, but I can't work out from the logs if the time jump is in the actual file PCR values or something is going wrong in the duration measurement.
Tony