Back office issues when switching from 1.7.5 to 1.7.7.0

[@rthur]

Hello,

I tried to switch to 1.7.70 from 1.7.5 but I get some issues in my back office. Everything looks fine front wise.

Some examples :

- Button "add addons" doesn't work. Nothing happens when I click on it. Not the regular popup. Also, when I go to installed addons, the search bar doesn't work, I cannot search.

- Module selection doesn't display. It's like it loading for ever.

- Product page doesn't seem right, also order page doesn't display as it should

Anyone knows the issue?

Thanks