Hello Mike,
1. Symantec Desktop Encryption 10.3.2 Maintenance Pack 7 is compatible with Mac OS X 10.10.1 and 10.10.2. We are still testing with Symantec Desktop Encryption 10.3.2 MP6.
2. Two reboots are required when there is a fresh install of the MP7 maintenance pack.
3. CoreStorage should be disabled on MAC book.
Please check out lastest package for Symantec Encryption Desktop 10.3.2 MP7 on https://fileconnect.symantec.com by providing the updated serial number.
The system requirements KB article for Symantec Desktop Encryption for Mac OS X as below:
http://www.symantec.com/docs/TECH224417
Pease let me know if you have any questions.
Thanks,
Neha Agarwal