Uninstalling/reinstalling seemed to take care of the error, but my changes still are not saving. I can right-click and select Save Content before checking in. My only save option in the File menu is Save All Content. This seems to work, but when I close and reopen the file, my changes have not saved.

InCopy is new to me, but I haven't seen anything in the Help guide to figure out what I'm doing wrong. The Help guide indicates I should be able to use the other Save options in the File menu, but I don't know why they aren't available.