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9 hours ago, knut4shop said:

In my opinion, you have to modify the html-purifer class to allow inline css. 
In my actual version (1.7.6.9) it can be disabled, but it is it strictly not recommanded to do this. 

Hope this a better solution for you. 

Thank you for your advice.

I tried disabling HTML Purifier in BO Preferences but the issue persist.

I still get:

And also 404 Not Found for [DOMAIN]/[ADMIN-FOLDER]/index.php/sell/catalog/products/[ID]?_token=[TOKEN] - AJAX POST when trying to save the product.

If I dont do inline CSS or accented characters I dont get 404. Really dont get it

46 minutes ago, knut4shop said:

In my opinion, you have to modify the html-purifer class to allow inline css. 
In my actual version (1.7.6.9) it can be disabled, but it is it strictly not recommanded to do this. 

Hope this a better solution for you. 

Thank you for your advice.

I tried disabling HTML Purifier in BO Preferences but the issue persist.

I still get:

And also 404 Not Found for [DOMAIN]/[ADMIN-FOLDER]/index.php/sell/catalog/products/[ID]?_token=[TOKEN] - AJAX POST when trying to save the product.

If I dont do inline CSS or accented characters I dont get 404. Really dont get it.

Using the Code Source from the tinymce editor for CMS Pages (For example) I can use whatever I want. This happens only on product level fields.