Hey Brooke17,
This was never determined as a bug as I did not receive any additional information in regards to their issue. From the looks of it, you might want to try selecting your Texture Samples within your landscape’s material and set the Sampler Source to Shared:Wrapped to see if that resolves your issue. What could be happening is you are hitting the limitations of Direct SM4 Shader model.
Let me know if you have further questions or need additional assistance.
Cheers,