In your screenshot it looks like your code is still running, since your cursor isn't at a > in the Console and you can see the stop sign in the upper right of the Console pane. Does it ever finish? It looks like your object has something like 3 million rows , which I think would be extremely time consuming for ggplot2.
While it may be difficult with a shape file, if you can provide a reproducible example it will be much easier for folks to help you troubleshoot. See some ideas for how to do this here: