Archer's sling is not working
After you reload the lead balls for the sling, you can’t shoot your projectiles. So if you dont believe me try playing as an archer and use the lead balls for the sling. After you reload, you can’t shoot.
This has happened to me as well. In my case I reloaded when I was out and this happened. Reloading with some ammo left seems to work for me consistently. Next time I play the sling I’ll see if I can repro.
Also, sometimes I get into a state where I can’t fire the sling, and a couple times I’ve gotten into a state where I can’t switch weapons either. No specific repro instructions there unfortunately.