Hi,

I have

$conf['tag_url_style'] = 'tag';

in my local config, which generally works, but fails on numeric tags where it falls back to id-tag, for example instead of "2015"  the tag "88-2015" is in the underlying URL. I wouldn't mind that much if clicking such would actually lead to the group of images tagged with "2015", but instead it gives "Page not found" and then redirects to the tags.php page. I reckon that probably the id is prefixed because of an alleged ambiguity of numeric tag name and numeric tag id, but then it should actually work.. Note that removing the "id-" part from the URL so that only the actual numeric tag is left works fine and the corresponding tagged images are displayed. Maybe until I reach 2015 tags ;-P

Piwigo version: 2.7.4
PHP: 5.6.9
MySQL: 5.5.44

Thanks for investigating :)