If you are compiling in Enterprise and using Daily Builds your custom fonts might not work.
I was using 2015-2722 and fonts just display the default one. SDK builds in 2015-2722 have custom fonts working fine.
I rolled Enterprise back to the previous Public Release and that solved the problem.
I was also having screen orientation issues (should not rotate but stay locked to landscape as per build.settings) with the Enterprise Daily Build and very recent XCode 7.0, 7.1 builds. I rolled back to XCode 6.3 and orientation is fine again.