Lightbox only shows pictures for the links that are in the html source and MaxiGallery builds links only to the 5 pictures that it shows. The slidebox display mode will show all the pictures from the galleries.
If you want to have the lightboxv2 display mode, you’d need to do something like this:
1. call maxigallery once for each gallery and make it get only one picture:
[!MaxiGallery? &gal_query_ids=`56` &display=`embedded` &embedtype=`lightboxv2` &order_by=`pos` &limit=`1` &galleryPictureTpl=`mgGalPicTpl`!]
2. do a galleryPictureTpl chunk called mgGalPicTpl what contains:
<a href="[(base_url)][+maxigallery.path_to_gal+][+maxigallery.picture.filename+]" rel="lightbox[set[+maxigallery.picture.gal_id+]]" title="[+maxigallery.picture.title:htmlent+] - [+maxigallery.picture.descr:htmlent+]">
<img src="[(base_url)][+maxigallery.path_to_gal+]tn_[+maxigallery.picture.filename+]" class="thumbnail" title="[+maxigallery.picture.title:htmlent+] [+maxigallery.strings.click_to_zoom+]" alt="[+maxigallery.picture.title:htmlent+] [+maxigallery.strings.click_to_zoom+]" />
</a>
3. place the same snippet call second time for the gallery, but with a different template and limit value:
[!MaxiGallery? &gal_query_ids=`56` &display=`embedded` &embedtype=`lightboxv2` &order_by=`pos` &limit=`99999` &galleryPictureTpl=`mgGalPicTplHidden`!]
4. do a galleryPictureTpl chunk called mgGalPicTplHidden what contains:
<a style="display:none;" href="[(base_url)][+maxigallery.path_to_gal+][+maxigallery.picture.filename+]" rel="lightbox[set[+maxigallery.picture.gal_id+]]" title="[+maxigallery.picture.title:htmlent+] - [+maxigallery.picture.descr:htmlent+]"> </a>
So what all this will do is that it will show one picture from the gallery and then build "hidden" links from all the gallery pictures to the same lightbox picture set. It should work.