I just got a Dragon 1 Ths miner and I'm struggling to get it to work here.
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I have a feeling this is a minimum difficulty setting as Guild allows me to set 1024 which lets the miner work.
There is no such setting at Slush though.
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I have a CoinTerra running at Slush's pool, and it does suck for a little bit when it starts up at a difficulty of 3. But it doesn't take very long for it to vardiff itself up to 1100 or 1200. Is vardiff not working for you? Is that the problem you're seeing, or is it some other connection problem?