The sorting buttons (including the inline commenting) are not available for the default comments pagination type ... It's only active for and other AJAX pagination types. So navigate to Dashboard > Settings > Discussions admin page, and uncheck the "Break comments into pages with…" option. 

It's described here: https://wpdiscuz.com/community/f-a-q/if-the-wpdiscuz-sorting-buttons-are-missing/

Please watch this video: https://www.screencast.com/t/MUa16OXy6O

Regarding the second issue, I'll let you know a bit letter. 

Yes if it's possible. 

You can also create a dev/staging copy of your website in some sub-domain and send admin details to infogvectors.com email address.

You can use Duplicator to create that site. It's too hard to check the issue on your live website.

Both issues you've mentioned are not found on our test websites. Please send the admin login details to infogvectors.com email address. I'll ask the developers to check the issues for you. 

Hello again,

I cleared the cache of my browsers, my website, WPdiscuz.

I have an article with comments online, when I go to see the comments, I still don't see the icon with green or grey...

J'ai vidé le cache de mes navigateurs, de mon site Web, de WPdiscuz.

J'ai un article avec des commentaires en ligne, quand je vais voir les commentaires, je ne vois toujours pas l'icône avec verte ou grise…

Please keep us informed. 

The button is located in the Dashboard > wpDiscuz > Settings > General Settings tab.