I am using ArcMap 10.3.1. What I have is a single polyline feature for which I am trying to edit the vertices. The only thing check in my TOC is the shapefile I'm trying to edit, so there can't be anything else selected simultaneously. I can select the feature, but when I attempt to "Edit vertices," I get an error message telling me to "Select a single editable feature to modify." I have tried stopping and restarting editing sessions, both by selecting "Start editing" under the individual entry in my TOC and from the editor toolbar, with no difference. I could just be reasonable and create an entirely new feature; I see no reason why this should not be working, and it's driving me crazy. Can anyone shed any light on what might be happening here?
You might try a few different things, checking along the way, to see if it gets resolved...
- Check to make sure that the line does not have a duplicate geometry.
- Run ArcToolbox>Data Management Tools>Features>Repair Geometry.
- Run the Multipart to Singlepart tool (same location as above) as a test - should not make a difference normally but might help whittle down the error.
- Right click the layer of interest in the Table of Contents and go to Selection>Make This The Only Selectable Layer. Right click the map and choose clear selected features.