[Desperate!] Mat not right on mobile - fine in engine previewer?

This is how the mat appears in the mobile previewer (identical on Mac and PC):

This is how it appears on a mobile device (IOS 8 iPhone 5, IOS 7 iPad 4. Both Engine versions 4.4 and 4.5 do the same thing):

Anyone know what the problem might be?

here’s my material:

Thanks for reading!

Turns out there was no mipmaps on the texture… taking the original file, scaling it into a 1024x1024 texture and re-importing fixed it!