"Save" function shows but doesn't open.

Have other users ever had the "save" function quit working completely? I have enough iDrive space to save the document. I'm on a Mac. This happened after InDesign wasn't loading properly. So I shut InDesign and reopened it. Now InDesign allows only "save as" not save. The "save" option shows up, which I click, but it responds with "save as", which shouldn't happen. I am hesitant to replace the whole document on a "save as" basis, when this shouldn't be happening anyway. Perhaps it indicates a glitch, that could cause other problems. I do see the previous changes. The "save as" document looks complete. But why should I even be asked to use "save as" when "save" is supposed to work. This is disconcerting when such a core, basic function, "save", is not able to open at all. I am going to shut down the whole Mac. Restart it and see what happens.

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