I have the same display on my control panel as well, so the driver appears to be correct...assuming when you installing the driver, Spring DAC is in power off state until the installation is completed, somehow, DSD512 signal is not being send from SU-1 to Holo Spring. I am not familiar with JRiver, so not sure if there are some differences between what I use, which is HQPlayer, and JRiver. I did run into an issue couple weeks ago getting display with just bars across when playing 44.1K frequency family music files, and later found out one of the output side SMD resistor near the 22.5792MHz oscillator was improperly installed from the factory, and finally broke the contact, preventing the signal from 22.5792MHz oscillator from going into the Xilinx FPGA input, once the resistor was re-aligned and soldered back to its proper location, I was able to restore the 44,1K frequency family music files playing all the way up to DSD512. Your issue isn't the same, because you are able to play DSD256 files, but no signal output to Spring DAC when playing DSD512, which I wonder if using HQPlayer will work but not JRiver? Another thing to look, although not sure if it will make much difference, is the control panel "Buffer Settings". Mine currently is set with "USB Streaming Mode" to "Reliable", and "ASIO Buffer Size" to "Auto".