That's odd. My test machine at work seems to be running InDesign 9.3 ok on Yosemite 10.10.2 although I have not given it a thorough testing.
Is there something (anything or host of things) not working in your 9.3 that I could try in mine so that I can fully test it. The point for us is that we use a Xinet asset management tool and they haven't written the InDesign plug-ins yet that tag the files for ID 2014. So for us it's not as simple as just using 2014.
Anything specific you can point out as a good test would be most welcome.
Many thanks