If you upgrade the OS then it is not 100% guarantee that it would fix the issue. For troubleshooting the basic steps we need to follow is the tech specs of they match the software requirements or not.
If OS is 10.7 and the software is not tested on it, so the issues are not known, you can run into issues like these.
The upgrade of you OS is must if you are working on cc 2014.
on this OS cc is supported.
Thank You
Arjun