404's after WP and woo updates

There is no conflict. Likely triggered by translation.

Go to settings > permalinks and save.

I checked all permalink settings but looks to me OK.

Please find the screenshot about the permalinks settings:
https://goo.gl/XeNq24

It’s not about the settings themselves. The save flushes the rules. Do it ??

On the top of the picture you can see I pushed the save button. I did it again on lot of settings and nothing happened.

I turned on the debug settings in the config but nothing error.
Is there any chance to debug the permalinks?

Mike can it help to you if you can log in to dashboard? ??

Have those index.php always been there? https://www.ads-software.com/support/topic/remove-indexphp-from-permalinks?replies=5

I installed Htaccess Editor plugin to check what is inside of that. This plugin say “Htaccess file does not exists!”

I changed the permalinks setting ->
– common settings to default “Plain” (https://domain.com/?p=123)
– product permalinks is default (https://domain.com/product/sample-product/). After this modification all product page can work without issue.

Next change permalinks settings ->
– change back common settings to post name (https://domain.com/index.php/sample-post/)
– product permalinks is default (https://domain.com/product/sample-product/).
Still working all product page.

Next change permalinks settings ->
– stay common settings on post name (https://domain.com/index.php/sample-post/)
– change product permalinks to shop base (https://domain.com/shop/sample-product/)
Product page can not work, 404 issue

So I am sure there is a conflict between WP 4.4.2; WC 2.5.2 because the permalinks can not work in any configuration.

Is there any opportunity to use permalinks with any configuration?

Create the htaccess file so you don’t need index.php in permalinks.

Thanks Mike, for your fast response to my question. I had already done what you suggested but what I didn’t realize when I posted the question was the site owner had also updated the site theme and tinkered with some settings which triggered the incompatibility.
I was able to revert and all is well now.