Since you updated your Mac OS X operating system to Yosemite you notice that some of your musical notations or added text are not properly written or missing.
You can easily fix this issue by downloading the Guitar Pro 6 Jazz font from this link.
Once you have downloaded your Jazz Font file, you simply need to add it to the Fonts folder of you Mac.
- Close Guitar Pro 6
- Open your Finder and select the "go" menu at the top of your window
- Select "go to folder"
- Enter the following address "System/Library/Fonts"
- Add the file you just downloaded to the "fonts" folder.
Your font issue is now fixed!