[solved] Backoffice CSS Missing after Update 1.7.2->1.7.6

[passio]

Hello eveyone, I had this problem for the 2 previous day, I tried all i could but can't fix it. Please, I really need your help.

Edited March 23, 2020 by passio (see edit history)

[passio]

Hi, I solved the problem thanks to the Plesk Web chat. 
Problem came from pagespeed that continue to run even when disabled. this is transcription I got :

Hello Quentin,

Thanks for your time during our chat session.

We talked about pagespeed staying active after disabling it from the Plesk UI, we tested on domain https://www.WEBSITE.fr/, then we added then following directives in Domains > example.com > Apache & Nginx Settings > Additional Apache directives_
 

<IfModule pagespeed_module> 

ModPagespeed off

</IfModule>

After this, the pagespeed stopped appearing in the console for domain https://www.WEBSITE.fr/