At some point this morning, something glitched. Unread items from prior to today (across several - maybe all - of my feeds) disappeared. The items I can remember, do not appear in the Read Stories river. I have found several of them by going to the feed, showing all stories and marking them as Unread.
I checked both web and Android.
It’s possible you marked everything as read, as there are a few keyboard shortcuts that do that. I added code a few months ago that pops up a confirmation dialog when marking more than 100 stories as read at once.
I suppose it is possible, but I’m usually pretty careful (and I don’t recall seeing a dialog box, but it was definitely less than 100 anyway). Out of curiosity, what are the keyboard shortcuts I should watch out for?
Hit ‘?’ and you’ll see the full list.