Since the shift to the newer version of Express - specifically since only having the ability to move old files over to the new version - I have had pixelation problems if I add an external image (the 19 Media Group logo, our podcast logo) as PNG files into a new or existing project. They look fine if I zoom in while in Express, but once I download them, you can see the result. It's an extra step, but I have had no issues in PhotoShop. Express is just much faster (I imagine that's why the name), but right now it's a multi-step, multi-platform process.