I have the same problem with the "Missing linked files" like many of other people here before, but in my case, the "missing files" are ALL my CC graphics on every single ai file. It could have been fine, but the "missing" linked files repeat itself above every artboard every time I edit the text in it. I can't clear them all like someone here said to another question about the subject because I need all of the files at my artboards obviously, and for some reason when I try to relink the file from the CC Library it says "select a graphic to relink" and then when I move the cursor above them the text disappear and when I click the file it does nothing. I can't work like that.
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