(Please Note: This solution will work on Yosemite to current OSX.)
Sometimes after upgrading your Mac OS, the emWave2 and emWave Pro programs are unable to find the Sensor/Devices.
Try this first:
- Quit the emWave application.
- Go to Library / Application Support / emWave
To find it, double click on the Yosemite hard drive icon or find the Macintosh HD.
Select Library, then select Application Support. - Delete the emWave folder you see in the Application Support folder.
Run the application, it will reinstall Application Support files automatically.
Try running a Session again.
If you are still having difficulties, please contact HeartMath Tech Support