hope someone can help. I use an Antminer U3 on a Raspberry Pi with Minera and CGminer.

When I mine everything with Scrypt-Algo, I get 100% rejected shares. My current pool is ghash.io.

My log looks like:

Rejected 09ffd3f1 Diff 26/16 AU3 0 pool 1 (Low difficulty share)

my config file:

{
    "api-listen": true,
    "api-allow": "W:127.0.0.1",
    "log-file": "\/var\/log\/minera\/cgminer.log",
    "scrypt": true,
    "scan": "all",
    "pools": [
        {
            "url": "stratum+tcp://multi.ghash.io:3333",
            "user": "WORKER",
            "pass": "123"
        }
    ]
}

My additional options are: --au3-volt 780 --au3-freq 238

Minera shows a hashrate of about 60 GH/s, Ghash.io shows about 1MH/s in the multipool.

When i change to the bitcoin pool, everything works fine.

Any ideas? Could it be affected by the pool difficulty, i can set on the ghash.io panel?

Thanks in advance