After a few minutes of recording using the Prog demultiplexor I get the following error:

Hm. But no problem with other demux? And no problem without recording?

No others are fine, I normally use Microsoft but sometimes use Prog to watch HD as it seems to have less overheads. I must have forgotten to switch it back to Microsoft and started to record and then got the error. I have tried all overs just to prove it is only Prog and it only appears to arise while recording (standard res) not tried HD.