Hello Darktable Devs. I think I've found a strange bug. My exported image shows a line across the top which appears to line up with the top keystone line in my original image. Strangely, it's colour changes based on the image behind it. None of the other keystone lines appear. The artefact doesn't appear in darktable's preview or darkroom view. No error messages I've put the files including a debug run of exporting the image here: https://copy.com/6rabvprudE2uaDLT
I'm using version 1.6.7 on an up to date Manjaro Linux 64bit AMD with an nvidia graphics card. Konsole output
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