SDK 3.4 gradient exceptions in Xcode 6, iOS 7.1 and 8.0

It seems that in 3.4.0RC the behaviour of background gradients has changed. I have a number of places where I am using gradients, some defined in code, some in the TSS file. They used to work as expected, but now give this error:

[ERROR] :      message = "Invalid type passed to function";
[ERROR] :      nativeLocation = "-[TiGradient setColors:] (TiGradient.m:168)";
[ERROR] :      nativeReason = "expected: Array, was: Object";

{
 type: 'linear', 
 startPoint: { x: '50%', y: '0%' },
 endPoint: { x: '50%', y: '100%' },
 colors: [ { color: "#ffffff", offset: 0.0},
 { color: "#f0f0f0", offset: 1.0 } ] 
}

".editor" : {
   backgroundGradient: { type: 'linear', startPoint: { x: '50%', y: '0%' }, endPoint: { x: '50%', y: '100%' }, colors: [ "#87C2E5", "#305582" ]},
},

Using either code or TSS to set the background gradient causes this error.

Ti SDK 3.4.0RC, Mac OS 10.9.4, Xcode 6.0.1, Simulator iOS 7.1 and 8.0.

Any ideas?