After editing your_css.css it not includes in source code.
Tried to enable and disable LESS

Dear gogengame,

Please disable less developement and check your site again.

Thanks & regards!

Of course it`s disabled.

I Just tried to turn in on, clean cache, and turn off again and clean cache, because found this advice in other topic.

It does not work for sure. on/off/clear/on/off/clear... nothing happens. shame
It is total crap! Even you dare to try To convert please Click hereoption

Do you want to convert less2css?
Warning: The content of *.css(path: ROOT/templates/sj_company/css) will be replaced in each converting less2css
Yes No
After the procedure it tells it was successful and asks Yes No

Dear palos,

We are sorry for this mistake. Please open file \templates\sj_live\includes\frame_inc.php find this code:

$yt->ytStyleSheet('css/template.css');
$yt->ytStyleSheet('css/pattern.css');

edit to:

$yt->ytStyleSheet('css/template.css');
$yt->ytStyleSheet('css/pattern.css');
$yt->ytStyleSheet('css/your_css.css');

Thanks & regards!

Thanks yennt!

I was looking for it in the xml file as usual but have not found.
includes\frame_inc.php was out of my sight...
Now it is finally solved.