[ubuntu] Specific Darktable question

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http://ubuntuforums.org – Hello, I can't seem to find any Darktable specific forums so I thought I would try here. Just curious if anyone has an idea about an issue I am having. When I upload my photos (nikon d700) into Darktable, my jpgs seem fine, but all of my raw files are wildly over exposed. I would greatly appreciate if someone has some idea about this. Thank you very much, Mark (Hardware)