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It may have "nothing to do with simple layers being switched OFF or frozen," but could it be a slightly less simple aspect of the same issue? Are you by any chance working in Model Space through a Paper Space Viewport? I have occasionally found myself in that situation when the current Layer is frozen not in general but just in that Viewport. For certain entity types, in the process of drawing them I can see them, but once they are drawn [complete the Text content, for instance], they disappear because their Layer is frozen in the current Viewport, but they're there in Model Space. But it does vary with entity type -- Blocks, or copied/pasted elements on such Layers, are not visible while dragging to their insertion points, though that may vary by version.