I didn't upgrade to FM15, so I am assuming the following is related to FM16.
I used to be able to make changes to fields, like adding a conditional formatting or changing a font size without any problems. With 16 I find that I have to "ungroup" or some other such activity before making these changes. In some cases it has meant deleting an attached script, making the change and then re-attaching the script.
I don't see this as a move forward. But I don't see any other people commenting on it, so have I missed something in the background.