BBC iPlayer Downloads
If you're having a problem playing just one programme, there could be a problem with the Digital Rights Management (DRM) licence associated with a particular download (a valid license is required to play a programme). It's possible that a licence has been corrupted during the downloading process or perhaps the licence has expired or even revoked.
Try deleting the programme in iPlayer Downloads and download again.
DRM licence has expired.
A programme should automatically be deleted from BBC iPlayer Downloads once its licence has expired. If your computer wasn't connected to the internet when the licence expired, it's possible the programme may still be visible in the iPlayer Downloads console. In such cases, you can manually delete the programme.
If a programme has been revoked (perhaps for legal reasons) and has not automatically been deleted you can manually delete the programme. It's also worth checking the BBC iPlayer website at a later time to see if the programme has become available again.
Delete a programme
You can click the option to delete a programme. If this does not work you can click on ‘Settings', navigate to the downloaded programmes file location given on this page and remove the file you want to remove.
Corrupt DRM licence
There may be a data problem with the programme's DRM licence you downloaded. If you can still download the programme, delete the one in iPlayer Downloads and try downloading again.