I've submitted bug report #890117, but maybe I'm just overlooking some new settings that I need to change? As of beta 11, all Sprite/UI textures are ignoring their transparency and rendering solid black instead of transparent for pixels with alpha. They are also always aniso level of 16 - attempting to change this and hitting apply resets it to 16. I've checked quality settings and made sure I've selected the right setting but this still happens.
Is there some new texture importer setting...
No transparency in Sprite/UI textures in beta 11?