I have WP 3.6 and Nextgen 2.0.11 working.
At first the custom css area didn’t work for me either. Then via FTP I gave permits to the /ngg_styles/ folder, nextgen automatically created the nggallery.css file and now it works perfectly and it’s very comfortable. I don’t know how you can say that the custom css works with 1.9.13 since before there wasn’t.
That’s for custom CSS area.
For size album’s thumbs at the moment you have to modify a php file not CSS. Photocrati is aware of the bug and I think he’ll introduce the fix in a next release.
Maybe he has already introduced correction in 2.0.11, I don’t know because I’ve installed that version when it was in beta and I fixed it there.
Anyway, you must search in /nextgen-gallery/products/photocrati_nextgen/modules/nextgen_basic_album/adapter.nextgen_basic_album_controller.php at line 153.
// legacy templates expect these dimensions
$image_gen_params = array(
‘width’ => 91,
‘height’ => 68,
‘crop’ => TRUE
Change width and height and it’ll works.