Vertex select is on and it's properly making new vertices but it's just making them on top of the existing one rather than to my mouse, any idea why this is? It works in other projects, and I've tried load factory settings and then open without loading UI and still no go.
Edit: If I add a new cube in the project I can extrude it just fine, it's just the original object that doesn't extrude properly. I can still grab the vertex and move it that way though.