[solved by reinstalling Prestashop]Problem with editing&adding products after migration

[webmasterBS]

Hi,

I have a problem with adding or editing products in the back office. Whenever I want to edit/add product I get the infinite spinning circle over the save buttons in the general info tab. When I try to switch to any other tab I get the blank page where options should show up.

This is what I get in the Console:

Uncaught ReferenceError: tabs_manager is not defined
    at HTMLAnchorElement.<anonymous> (http://XXXX.pl/adminXXXX/index.php?controller=AdminProducts&id_product=1&updateproduct&token=27884cd765222dd207b6694e1c44b447:987:6)
    at HTMLAnchorElement.dispatch (http://XXXX.pl/js/jquery/jquery-1.11.0.min.js:3:8066)
    at HTMLAnchorElement.r.handle (http://XXXX.pl/js/jquery/jquery-1.11.0.min.js:3:4767)
    at Object.trigger (http://XXXX.pl/js/jquery/jquery-1.11.0.min.js:3:7167)
    at Object.e.event.trigger (http://XXXX.pl/js/jquery/jquery-migrate-1.2.1.min.js:2:6732)
    at HTMLAnchorElement.<anonymous> (http://XXXX.pl/js/jquery/jquery-1.11.0.min.js:3:14925)
    at Function.each (http://XXXX.pl/js/jquery/jquery-1.11.0.min.js:2:2969)
    at e.fn.init.each (http://XXXX.pl/js/jquery/jquery-1.11.0.min.js:2:845)
    at e.fn.init.trigger (http://XXXX.pl/js/jquery/jquery-1.11.0.min.js:3:14901)
    at e.fn.init.n.fn.(anonymous function) [as click] (http://XXXX.pl/js/jquery/jquery-1.11.0.min.js:4:15584)
index.php?controller=AdminProducts&id_product=1&updateproduct&token=27884cd765222dd207b6694e1c44b447:1093 Uncaught ReferenceError: tabs_manager is not defined
    at index.php?controller=AdminProducts&id_product=1&updateproduct&token=27884cd765222dd207b6694e1c44b447:1093
    at dispatch (jquery-1.11.0.min.js:3)
    at r.handle (jquery-1.11.0.min.js:3)

 

I have a Presta 1.6.0.14 which works as a catalog only. I had to migrate it to a different subfolder due to the folder structure reorganization. I made only the database backup (I have files backup from 1 year ago, not much changed since then). After successful migration I randomly updated a few modules (*dum, dum, dum, dum...*). Not sure if everything with product tab worked good before that.

I've tried restoring database, replacing /js , themes/default-bootstrap/js and /modules folders also adding some supposedly missing .js files to the main /js folder

Any other suggestions I can try before I just setup a new store...? 😕 Any help would be much appreciated.