I recently had to reinstall repetier host and server. Now I am trying to us Slic3r to slice an object but after clicking slice nothing happens, even after waiting 15 minutes. Have I not set something up correctly or not completed something?
If it fails it shows the error message in a popup window. You can also enable log and will see slic3r output there.
But since there is no real development on slic3r you should better switch to PrusaSlicer which is the successor of Slic3r with much more features now and still in development.