Help Bob or Roger Now that acorn-sdr running, I have tried for two days to get JavaSDR going. I am getting: (ozy_ep4_io_thread: get_spectrum_free_buffer returned Null! get_spectrum_free_buffer:NULL) running in a loop, when I run ./javamerc. qjackctl shows jackd connection between system and mercury. I suspect something to do with libusb-1.0.0. Thanks for any help