MBP not enough allocatable device-memory

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- Device #2: Device does not provide enough allocatable device-memory to handle this attack

This kind of error is actually that you do not have enough (device) memory to handle scrypt. But you're right, it should skip over the error and continue. Please post a GitHub issue for that.

ERROR: clEnqueueNDRangeKernel() : -54 : CL_INVALID_WORK_GROUP_SIZE

This is a known error. For some reason on OSX, on CPU, it's not allowed to use a 2nd (or 3rd) dimension for the kernel execution in GPGPU. It's a runtime limitation which is basically not there, it's a pure software limitation. I can't workaround this, because for bitsliced DES kernel (like LM) it's required. However the problem is the same. It should skip over and continue with the benchmark.