When you are using the “master” branch of the GIT repository you are using the “latest and greatest”. The master branch is used for development and some upcoming features are working and some are not. If you want to use the brach that was used for the latest release then switch to the release branch – this should be stable but will be missing some features.
However I have tested that beep and tones should work while wav playback does not. Are you trying to play more that one tone at a time?