I've recently uploaded a new version of a DataField app and had a report this afternoon from a user that the Settings button has disappeared in the ConnectIQ app. The user sent me a screenshot (https://imgur.com/a/0mxjgul) and the settings button certainly does seem to be missing, but it's not missing for me on my iPhone and I know at least two other users don't have the problem because I've received messages of thanks about a new setting I introduced in this version (just a boolean checkbox - nothing that I think could have broken anything).
It seems like a problem with the ConnectIQ app on the user's phone as opposed to a problem with my app specifically. After all, it compiled just fine and if the settings work on one phone I don't see how they could fail so dramatically on another. I saw that this happened once three years ago on iOS due to a bug that caused the button to be rendered 1px tall - any idea whether it's happened again?