This is present in versions L and M.
1. Open Manage Fields
2. Create a new field
3. Observe that the box indicating the presence of code in the field is ticked. This is problem 1. There is no code.
4. I make the field type as text.
5. I want to create a pull down field, so I open Editor.
6. Cannot tick Auto List nor can anything be entered in the box below.
7. Closing and re-opening Manage Fields clears the ticked box under #3 and allows entries in Editor.
I don't know if other areas of Manage Fields are affected too. I don't have the time to thoroughly test.
This is infuriating when one has several new fields to enter. To quote that great American philosopher, Homer Simpson, "I'm not a praying man, but Superman, please help!"
Jon