Ok, to reproduce:

https://www.transferbigfiles.com/cd074ea7-1a1d-4e75-816b-5b8a9afd1cd3?rid=9T46o9v4lSAU45x7c6GZxw2

Download the following image (41 Mb):

On the darkroom mode activate the dithering module.

On lightable just export as jpeg on disk (3000x3000, 95% quality).

The image will be covered by a big black patch. Disable the dither
module, export again and all is well.

For reference, the culprit is:

> commit d41531d53f9045e31c8a2c713b0f1363c47cb5de
> Author: Ulrich Pegelow <[email protected]>
> Date:   Thu Jan 3 18:06:16 2013 +0100
>
>     dithering: automatic dithering according to output format with module 
> being auto-applied
>

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  http://www.obry.net

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