Just to add that I was another user who had to reset my T2100 last night so I could watch the Dad's Army Lost Episodes recorded from Gold HD. Note that it is worth making a note of the Audio Delay value you have set as this is lost in the process - I thought I remembered what it was but that was the value for another PVR and it is fiddly to change and check on a Youview box (my other PVR has an onscreen slider to adjust while noting its effect).
Just to be clear this meant I could now watch the episode already recorded which to me suggests that there was some memory corruption somewhere affecting the privilege needed to view the recording. Wonder if this is another side effect of the FF on internet recording bug which leads to loss of all audio?
Me too, recorded Dads Army, now will not play. Sigh.....guess a factory reset then!