Ubooquity never modify you files, ever. That's an fundamental rule that I don't want to change.

But unless I change my mind later, I won't even ignore them. Ignoring these files would require to extract at least partially each image instead of relying on their name as Ubooquity does today.
The comics containing these file are just badly done and must be corrected.

The problem lies in the "__MACOSX" folder contained in the cbz. It contains fake "jpg" files which can't be read by Ubooquity.
The fix is simply to delete this directory inside the cbz (using any archive utility, like 7-zip), launch a rescan and perhaps refresh you browser's cache.

More on this matter here.

The core of the problem is that this folder contains jpg files which are not real jpg.
It should never be included in a comic.
(and the idea of generating files with wrong extensions is beyond me)

I could add a filter to specifically ignore it, but that would be a hack since the problem lies more in MacOS thumbnail system than in Ubooquity itself.

EDIT: the folder I have is in fact "__MACOSX", not .DS_Store. So I have my answer, I don't want to have to guess all the names Apple might think of to generate folders full of fake images.

And it seems I was wrong. A user sent me a comic which fails scan due to the .DS_Store __MACOSX folder.

I'll keep it in mind when I implement additional sorting criteria (I have had other request on sorting, so I'll do it at some point).

Yes, I'll test it and include if the tests are conclusive.

I guess it's too big for email, but if you have a link I could use to download it, send it to "tom at vaemendis dot net" and I'll take a look.