In case it helps with diagnostics, below is the error message I get when I try to run Smartcoin after a LinuxCoin reboot. It appears to be related to OpenCL.
Invalid MIT-MAGIC-COOKIE-1 keyInvalid MIT-MAGIC-COOKIE-1
File "/opt/smartcoin/smartcoin_devices.py", line 5, in
devices = p.get_devices(device_type=cl.device_type.GPU)
pyopencl.RuntimeError: clGetDeviceIDs failed: device not found
done.
Are you root when running smartcoin? If this is over ssh search this thread for magic-cookie - you'll need to run a few commands to get it working, it's here somewhere.