Hi, I just took a test scan using default settings version 2.3.3
And in my XML sitemap they were all there. Remember per default that space gets encoded to %20. See:
http://www.microsystools.com/products/sitemap-generator/help/character-percentage-url-encoding/Thje URLs you listed also all seem to be included in outputted XML sitemap and website scan results:
<url>
<loc>http://kenbillington.ch/photobank/Swans/Black%20Swan%20(Cygnus%20atratus)/slides/Black%20Swan%20(Cygnus%20atratus)%20(1).html</loc>
<changefreq>monthly</changefreq>
<priority>0.1</priority>
</url>
<url>
<loc>http://kenbillington.ch/photobank/Swans/Black%20Swan%20(Cygnus%20atratus)/slides/Black%20Swan%20(Cygnus%20atratus)%20(2).html</loc>
<changefreq>monthly</changefreq>
<priority>0.1</priority>
</url>
<url>
<loc>http://kenbillington.ch/photobank/Swans/Black%20Swan%20(Cygnus%20atratus)/slides/Black%20Swan%20(Cygnus%20atratus)%20(3).html</loc>
<changefreq>monthly</changefreq>
<priority>0.1</priority>
</url>
<url>
<loc>http://kenbillington.ch/photobank/Swans/Black%20Swan%20(Cygnus%20atratus)/slides/Black%20Swan%20(Cygnus%20atratus)%20(5).html</loc>
<changefreq>monthly</changefreq>
<priority>0.1</priority>
</url>
<url>
<loc>http://kenbillington.ch/photobank/Swans/Black%20Swan%20(Cygnus%20atratus)/slides/Black%20Swan%20(Cygnus%20atratus)%20(6).html</loc>
<changefreq>monthly</changefreq>
<priority>0.1</priority>
</url>
<url>
<loc>http://kenbillington.ch/photobank/Swans/Black%20Swan%20(Cygnus%20atratus)/slides/Black%20Swan%20(Cygnus%20atratus)%20(7).html</loc>
<changefreq>monthly</changefreq>
<priority>0.1</priority>
</url>
Same with the rest I checked, e.g.
http://kenbillington.ch/photobank/Swans/Mute%20Swan%20(Cygnus%20olor)/slides/Mute%20Swan%20(Cygnus%20olor)%20(11).htmlIf you don't like URL encoding, you can disable it in A1 Sitemap Generator (see the above linked help page), but it's parts of XML sitemaps specification that URLs get URL encoded