If it was a busy photo with lots of colors, shapes, angles, pixelation, or had any other complex design, I could understand - but this is as basic a test as it gets. I can't even say this is a "beta" problem per se, as other versions of Photoshop also ...
If you have an image with text, but the text and background are compressed into a single image, Photoshop has a few easy tools to remove the background from the text in a flash. With the help of the Magic Wand Tool, the Select Color Tool, or Channels, there are a variety of ways ...