So far with 1.1.3, it appears that DAG generation fails if one of the GPUs falls too far behind the rest when creating. Which is weird because it was on a identical machine with the rest.
I restarted it and it generated the DAG fine. So it appears if the loop is slightly delayed it screws things up. Haven't had it happen since.
Also had a rig crash, not sure if that's related to the new miner though. Hashrate appears to be about 4-5% less then 1.0.8
When I tested exp few weeks ago I got about 7%higher hashrate than by ethereum
I've had consistently 4-5% increase on Ethereum, 7% on Expanse and 12% on Shift vs stock ethminer over and above previous mining hash rates respectively, so its not low difficulty, its better hashing performance. So while the improvements aren't 7% across all Ethash based coins they are at least consistently faster hash rates.
They use the same algo... Not sure why you'd see a increase in performance with other coins unless the pools you're using are just better.
Since Dagger is weird it could be the smaller DAG files are doing it as well seeing as the bigger the DAG file gets, the more performance loss occurs. I believe this is different from AMD to Nvidia hardware though. Make sure you note the cards you're using.