Starting just a day or two ago, I have been running into the same issue every time I try to Display XY coordinates from a .csv file. When I add a .csv file, Display XY Data, I get an error that there is no Object-ID field (even though there is). I've even tried exporting the data as a shapefile afterwards, and I still can't edit any data in the attribute table. I can't figure out what to do.
Any tips or ideas?