This sounds like a blender problem. When blending nuts into a smooth, creamy base, it is important to use a high-speed blender, like a Vitamix. If you use a lower-powered blender or a blender, such as the Ninja, with blades that go up the stem, you will likely have difficulty making a completely smooth cheesecake filling. If you are committed to cooking vegan recipes from scratch, investing in a good blender is well worth the investment.