migrated a project from 2014.1.3 to 2015.1 and am getting no audio output from authoring tool

Question

Hello,  I've just upgraded from Wwise authoring (Mac) 2014.1.3 to 2015.1.  It went through the migration process as expected.  It 'plays' , as in the blue play button lights for the duration of an audio object being played, but no audio is heard and Wwise meters are inactive in the authoring tool.   This is true for all audio objects in both the Actor Mixer Hierarchy and Interactive Music.  Ideas?    -guy

Here's the text from the migration log

Project migration to XML Schema (XSD) version 70 is completed.
Some new object properties have been added or obsolete properties deleted. The project file was updated. These changes will not have an impact on your project.
Properties related to Platform(s) "'3DS, Android, PS3, VitaHW, VitaSW, Wii, WiiUSW, Xbox360'" were detected and removed from project as they were unreferenced. This could happen if you migrated a project from a previous version where some platforms were disabled. Disabled platforms are unavailable as they are being replaced by custom platforms. If you wanted to keep information relative to disabled platforms, enable them before performing migration.