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Looks like the new nav bar adjusted the header height, causing some clip with the transparent background image and the fill used. Pretty self-explanatory, should be easily fixable.
Close up from duplicate question.
I have this fixed locally - we will likely be deploying the fix in the next few hours.
Current revision is rev 2017.10.11.27368, so if that changes, the fix is in.
I checked this and they might need to set background image by -2px to fix it. Initially it was -38px.