This just happened to be today. After opening up WMP I booted up Blockland, I went to the Server Join GUI and I noticed the sound was different at first I just thought its because I turned up my speakers and such the noise would be louder, but when I went into a game all the sounds seemed to echo. Blockland is the only thing that seems to do this for me, although I believe it has something to do with OpenAL because my Backup Blockland also echo'd.
