v1.7.6.5 freshly installed but backend not displayed correctly with Chrome/Firefox

[Gohanki]

Hi

I installed PrestaShop v1.7.6.5  without any problem.

But some pages in the backend don't work correctly. For example the pages to add a product. See attached screenshots. First page is ok but then the next formulars (prices etc.) aren't displayed correctly.

On some other webpages, there are often problem with listbox that I can't select.

Why ?

I use Chrome 81.0.4044.138  and Firefox 76.0.1

Thank you

 

[Gohanki]

Hi. I have also this error when I submit the new product.

The CSRF token is invalid. Please try to resubmit the form.

I increased max_input_vars  to 15000, it didn't solve.

Then I downgraded PHP v7.3 to v7.1 and now everything is ok.

Edited May 20, 2020 by Gohanki (see edit history)