Oh no, bugger. I've not added any new packages for a while, but one thing I have been doing a lot recently is watching video streams, then saving them as MP4 files on the drive via the "Save last streamed conent" option in "Browse Media Files". Could it be that they are all cached somewhere and are causing an issue? I've just run the df diagnostic you asked for and all that came up was the attached. Now that I can get into the settings page again, I can see the effect of the error that you have spotted. See second attached image. This is just below the add user section and I think it's the section where you add EPG watchwords.