Button text not showing on iphone6

I have an app with buttons with text that works fine on android and ios devices except iphone6. On iphone6 the button is there, but the text doesn’t show. This app was built with Unity 4.5.4f1. Here’s what I’m doing:

GUIStyle custom = new GUIStyle(“Button”);
custom.fontSize = Screen.width/30;

if (GUI.Button(rect, buttonText, custom)

Any ideas what could be wrong?

Turns out to be an issue with iOS 8.2. On any device running this, the standard labels/buttons text doesn’t show. Updating to 4.6.3 fixes it.