I have a multiple layers that show features in the data frame and the layers are editable and labeled, but when you open the attribute table for these layers, it's empty. The only way to get the features to appear in the attribute table is to select them. I have also noticed that these layers have no symbology in the table of contents. Once again, they have symbology in the data frame just not in the TOC, and I cannot change the symbology anywhere to make it appear in the TOC. What's going on here?
In the TOC, make sure you are in "List By Drawing Order/Source/Visibility" mode (rather than by Selection), and of course make sure the expand/collapse icon to the left of the layer is showing a minus sign, meaning it is expanded to show the symbology, as in the following screenshot:
In the attribute table, make sure you are in "Show all records" (rather than "Show selected records") mode, as in the following screenshot: