It took me a long time, finally got an answer.
Several versions of VirtualBox are known to cause problems in Genymotion. For Genymotion to work correctly, make sure you have the correct version of VirtualBox installed:
Mac OS X: 5.0.26 (sound issue prevents version 5.0.28 from starting)
Windows: 5.0.28
Linux: 5.0.28
In any case, do not use version 5.1.x, as they are known to cause sound problems and, in some cases, prevent Genymotion from starting.
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