Hi,
Thanks for the replies.

I'm running on 390 drivers on both Linux and Windows. I'm running two 1080ti's, so I can't really downgrade the driver. When building spreadminer on Linux, I did need to comment out the following redefinition in two .cu files:

"typedef unsigned long long uint64_t;"

I didn't build the spreadminer on Windows. I'm mining against the Linux wallet daemon on both machines, which I started with:

simucoind -printtoconsole -daemon

with the conf file shown. Wallet was fully synced before mining.