Thanks for your bug report.
I just tested my own HDCD sample and it appears to work fine, so this issue might be somehow specific to your configuration.
I would very much like you to send me a snapshot of your dBpoweramp configuration - to do so, click [configure] in dBpoweramp launcher, Converter tab, click [save configuration snapshot]. Email the resulting file to
peter@dbpoweramp.com for analysis.
Now, in order to reset all dBpoweramp configuration, you can remove the ~/Library/dBpoweramp folder ( Finder: cmd+shift+G, ~/Library, remove the dBpoweramp folder ).
You can also rename it to dBpweramp.off to get a fresh profile to verify if the bug is gone, then restore it by removing the newly created folder and restoring the old folder.