Some pools report a false hashrate. These two work fine:
cgminer --scrypt -o next.afraid.org:8118 -u yourNBLaddress -p . --queue 0 -s 1
cgminer --scrypt -o pool.1nusa.org:8118 -u yourNBLaddress -p . --queue 0 -s 1
Anyway, Nibble has an issue, the difficulty is far higher that we can expect. Difficulty=3.99, the hasrate is only 46MH/s.
A feathercoin like issue?