Tara on "404 errors after update to 4.5.2 - permalinks don't work"

Hi, first of all i apologize for my bad english.
I updated a WP site from 4.4.3 to 4.5.2; when i finished, i tried to surf the site (it's an e-commerce) but every page i try to go, i ogot 404 error, except for the home page.
Main installed plugins are woocommerce, WPML, ninjaforms, and other. Theme is flatsome, updated to the last version.
Woocommerce is not updated to the last version because i got a message "2.6 is a major update so it is important that you make backups, and ensure themes and extensions are 2.6 compatible before upgrading.", so i tried to upgrade WP core before.
I cleaned the cache and deactivated WP fastest cache plugin before updating.
Once updated, backend works great, but frontend gives 404 errors. I tried to resave permalinks pages, i tried to use other configuration of permalinks, but the only one that works is the first ("Simple"), any other permalinks configuration doesn't work. It gives 404 error even if i click on "permalink" link in the page/product editor.
i tried to deactivate "woocommerce multilingual" plugin but it didn't work anyway.
Now i restored 4.4.3 version from backup to make my site work fine, but i need to update wp version.
I attach the working configuration of permalinks in 4.4.3 version:
page 1: https://dl.dropboxusercontent.com/u/13488421/permalink-funzionanti-4.4.3_1.JPG
page 2: https://dl.dropboxusercontent.com/u/13488421/permalink-funzionanti-4.4.3_2.JPG

thank you very much to those who will help me.