i did not get shares for 15minutes and it restarts miner...every 15minutes as no shares. with same settings on 1.7.0 it works and shares accepted.
EDIT: seems there are trouble with fork... block time 2 minutes and now it is 6 and still on block 1788000...
You got some trouble there if you are not getting any shares within 15 minutes. There is no trouble with fork cause this first block will take a lot of time to be found.
But you should have shares found. On my test rig with mixed cards everything went smooth, algos were switched and now it is mining with normalv4 (cn_r).