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note "./gradlew clean assembleqaDebug" works fine

Looks like a duplicate of https://code.google.com/p/android/issues/detail?id=223254

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It's a framework bug which was fixed for ICS (https://android.googlesource.com/platform/frameworks/base/+/ee6d5cfdff475f6c1119f060b139bdc1b621fa8b)

I'll add a workaround.

@chris after updating the version to 23.0.1 this bug still exists.

@boeser I made an workarround, that's worked for me. Check this gist:

https://gist.github.com/arturgaleno/5cca1934ed324bd2d9a7

While waiting for the next release I'm using this workaround http://stackoverflow.com/a/27496926/836540, by creating a fake FAB pre-ICS, while using support design library FAB for ICS and above.

Released in v23.1.0.

No, not fixed in 23.1.0.   Still seeing white FAB buttons in Android Studio preview and in Froyo:

http://imgur.com/wylo1sB

That appears as a normal fab on newer APIs.  As you get older, you get a white circle, and older still gets the src= icon, and older still gets this ring+shadow.  It kind of looks transparent, as if the inner shadow is coming through, but I'll let you be the judge:

http://i.imgur.com/wylo1sB.png

Using 23.1.0 support library, 24.0.0 support repository, and AS 1.5beta

The problem is actually down to an issue in GradientDrawable mutation pre-ICS. I'll see what I can do.

Released in the v23.1.1 support libs