Other users have encountered a similar problem and appear to have fixed it by entering a fixed IP like “127.0.0.1” instead of “localhost”. If that doesn’t solve your problem let me know and we’ll see if we can help.
see V1.3: Roon and HQPlayer issue [resolved in B194] and Roon 1.3 and HQplayer: No sound after update [Fixed in B194+]