A few days ago I noticed that the BBC iPlayer application on my laptop would not display the programme listing for downloaded programmes.
I went online to see that several other people have reported the same issue.
Re-installing the application made no difference.
Then I remembered that the external drive which I use for storing media files had disconnected unexpectedly recently, I considered that some files may have been partially written. Sure enough, when I moved the most recently modified files out of the iPlayer repository the programmes lists started working again.
Without accidentally disconnecting the drive or shutting anything down in an abrupt manner, my iPlayer installation suffered a repeat of the programmes list problem again.
I'm too busy to bother tracing the exact cause, but if it happens again I will try to isolate what specific download directory is causing this issue.