Losing edit ability for shapefile (converted from delimited text layer)

Question

I have been running into a bug with my QGIS 2.16.3 project. It has to do with editing a shapefile after closing the QGIS project and restarting the computer.

So I have a spreadsheet of locations of interest that I plot on my map. I complete this activity by first converting my spreadsheet to a CSV file then adding a new Delimited Text Layer to my project. My spreadsheet has a column for X and Y coordinates so I assign them to the correct field in the "Geometry definition" section. The data points show up in the correct place in my map. After this, I would like this file to be a shapefile so I "Save As" the layer as a shapefile and I am now able to edit the attributes in the file. Everything is fine until I close the project and QGIS program.

When I open the QGIS project up again, my newly created shapefile is still a shapefile, however I have lost the ability to edit the layer. My traditional way around this would to "Save As" it again as a shapefile and I would regain the ability to edit. However, this means I have to copy over all the rules, filters, and layer attributes I assigned to this layer.

Added screenshots

Answer 1

@csk had the right solution.

It's definitely missing some capabilities. A normal shapefile has "Add Features, Delete Features, Change Attribute Values, Add Attributes, Delete Attributes, Rename Attributes, Create Spatial Index, Create Attribute Indexes, Fast Access to Features at ID, Change Geometries." Maybe it's saved in a directory that you don't have permission to edit. Right click on the folder -> properties -> security. Check that you have full control or at least ability to read, write, and modify.

To resolve my issue, I changed the shapefile location from a server (where I did not have Full Control admin rights) to a local drive.