Will give him a few days to work out the kinks.
Tested on 7970, 280x, and 290x and yes I got the bin file released for Tahiti cores.... those were on W7 64
Only the 290x actually connected to the pool and received work,,, then just sat there as the CPU tacked up to 100%, miner restarts and repeats itself.
I have yet to test on 380x, RX 480's and 390x's....
Try to close it and restart it manually. Usually 2nd restart begins the mining. If it doesn't work after 4-5 restarts, it may be related to the RAM. You can try 1-4 cards and wait a bit for the RAM to be cleared and then start a new instance of the miner for the remaining cards.