InDesign CC Library Text Edit Option Grayed Out

This seems to be an intermittent issue; I've created hundreds of these for libraries in InDesign, but recently and with only some of my library entries, I am unable to edit. When I right click the item within an InDesign document, I get an error message that states that the text is uneditable in InDesign, but I can put it into a document. When I select the text to edit within the library, edit is grayed out.

Thanks in advance for your help.