A bug, I think...
If a gallery contains an image with a space character in its filename then the image is correctly added to the gallery and the image can be accessed via shortcodes. However the following problems occur:
- No thumbnail will be displayed in the gallery edit page (/wp-admin/admin.php?page=nggallery-manage-gallery&mode=edit&gid=X) because the img src url for the thumb has had the space character removed (the thumb file itself retains the space in its name);
- Attempting to view the image (from the per-image menu, or by clicking the image name) will produce a 404 error because the url has had the space character removed.
NextGEN Gallery v1.9.6
[ Please do not bump, that's not permitted here. ]