Mosaic with some images coming in black/white - Not as grid or background

[fitzpat_s]

Hi, I have created a mosiac and have had to add in additional rasters  - some will add in correctly as expected but some are coming in like the image attached. They are black to white. Any suggestions - I have rebuilt the mosaic one but it keeps occuring as i add data. Also the tiff draws fine on its own. 

Any help appreciated.

Thanks

[DanPatterson]

the same bit depth? pyramids? anything you can provide about the mosaic and the input rasters would help