‘iptables -L’ stalls after adding a rule with –source flag

I want to add a basic iptables rule limiting inbound SSH traffic to a single address. Although, after I specify the -s or –source flag, iptables -L fails to list rules and stalls:

~ iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

~ iptables -A INPUT --source 192.168.0.10 -p tcp --dport 22 -j ACCEPT
~ iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

### STALLS HERE