History not working in koreader

[Hopper333]

I'm not sure when this started happening, perhaps from an update a few months ago? I thought it might fix itself but it hasn't. Anyway, my history is frozen in a certain state and opening new books does not add them to the history. If they were a long way back in the history they stay there rather than coming to the front as they should.

This is surprisingly annoying as the history feature is very useful when you have several books on the go.

Where should I look to solve this? I can connect to a terminal but I'm not sure where history should be stored. I have seen talk of a /history folder but can't see it. Also talk about .sdr files which are present for some books but not others.

Is it a permissions problem? A setting on koreader? Has something become corrupted? Can I reset the history? (will be annoying to lose settings but not as annoying as no history!).

Any help would be much appreciated.

Kobo H2O with a koreader just updated and restarted through wifi and OTA update this afternoon, but no change. All books are on a SD card. Please ask if you need any more information.

Many thanks

Michael