calibre news download process was recently changed to preserve the original image from the website as much as possible (earlier everything would be automatically converted to .jpg). This is in general a good thing. You should report this bug to Moon+ hopefully they will fix it quickly, as .jpeg is a perfectly valid file extension for JPEG images.
There isn't anyway to do this easily in calibre, I suggest you stick with 0.9.11 until the bug is fixed in Moon+.
EDIT: I was wrong about not being able to change this easily in calibre, I have made the change that jpeg files are always saved with .jpg extension, in news downloads, will be in the next release.
Last edited by kovidgoyal; 03-26-2013 at 12:44 AM.
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