Greyed Out Insert under Developer

The Insert function is greyed out under developer. It is an xlsm, it is not protected and I do not have multiple selected. It worked fine till about a week ago, when all the macro buttons disappeared and I cannot use the insert function to get them back. The macros are still there and working, but it would be nice to have the button back.

The insert button only disappears for this file. I have the original saved from October and the insert button is fine on that one, but I really do not want to have to go back to that one and re-key months of data and adjustments.

Any help would be greatly appreciated.

thank you for replying. No it is not shared.