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Each one opened. All items checked off. Then clicked Mark for Fix. Clicked Done. Went into the main library view. Tried to Toggle Marked Books. No books are marked.
When books are Marked in Calibre, they are Marked with a PushPin. The only thing that it appears you can do in Mark for Fix is to do an Automatic Fix from within the menu. I don't want automatic fixes, I simply wanted those books to be marked so I could attend to them from within the main screen. But whatever "marking" is done inside the Check Library tool doesn't seem to carry over into the regular library view mode.