Yes, I submitted this exact same problem yesterday, with the new iOS (Apple) mobile client release 1.209.16. The rogue hideout/den randomly "pops up" and shows "Zzz" status (idle). If you open the building, there are multiple "Produce" buttons available. Should you choose to click one, my mobile client crashes.I haven't been having the Tavern issue but my Rogue Den regularly shows as idle even though it is full. (As long as I don't accidentally try to start a new rogue, it isn't an issue.)
You can exit the mobile FoE app, and restart it, clearing the "Zzz"s for an interim period of time, but they will reappear (for some reason). I"m trying to study what I do in the game to have them re-appear, but cannot track my playing to see that effect from a cause.
Support wrote me back that dev is "studying" it (or similar functioning...) so it's good to hear others are seeing it as well.