I have been working on an InDesign file for a couple of hours and then I would export it but there was an * next to the file name. So I tried to save it but all of the save commands are greyed out. I can export my files but I am afraid to exit out of the application because i won't allow me to save my files. I am using Adobe InDesign CC 2015 on a Mac 10.10.5.
Export to IDML, verify that the IDML will open, then force quit and restart ID. Your file should auto-recover, at which point you can try to Save As to a new name, or work with the IDML file.