Carrier restrictions Are not getting saved

[dominicm]

I am having a weird issue where all but bank transfer options are disabled in Payments->Preferences->Carrier restrictions. If I enable any others (check the checkbox) and save it, it does not actually save the change. I get "Successful update." message at the top but no changes ever gets applied. All but bank transfer option for the very top/first shipping method is enabled which also happens to be the default shipping method.

 

I have already updated to Latest 1.7.7.0 but issue persists. I use default theme with very few modules. I have revolut and paypal for payments enabled.

 

What can be causing this critical issue?

[psy_ch]

solution to this probably is most likely php setting max_input_vars... put it to 20000! Yes 20'000. It's what some prestashop dev told via github. Stupidly I just closed the github page talking about this issue But in my case this solved the problem immediately