This is a bug (now we’re finding out it might be a permanent message) and it seems that this message appears primarily when clicking on a Text Field or Text View or other similar NSObject.
This is only a log message and not a compile error message as signified by the date and time preceding the message. Therefore if your code is not working it is not a result of this console message.
If you run on a device the message will be [MC] Reading from public effective user settings
. If you run on the sim the message will be [MC] Reading from private effective user settings
.