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Load up in TileMill and I see issues like:
I see this both before and after 97463ab, though the severity is less after 97463ab.
See also #1480
I should mention that the size of the tile in TileMill is 1024x1024 and the bbox for the broken tile is 17532819.79994059 5009377.085697312 20037508.342789244 7514065.628545966, but I am unable to replicate this outside of TileMill after 97463ab.
17532819.79994059 5009377.085697312 20037508.342789244 7514065.628545966
@springmeyer - this looks very similar to the issue that being fixed in 97463ab - can you verify again TileMill is using latest master ?
just had a chance to test this again (http://support.mapbox.com/discussions/tilemill/5171-banding-issue-on-geotiff-layer) - looks fixed by 97463ab, closing!