Widgets wont go away / edit / add etc..

I have recently moved web servers. I copied my entire home directly, backed up the databases and just uploaded them both over to new server.

Ever since the move my widgets wont edit/delete/add/move etc.

It doesn’t matter what i do, the action wont save.

All i get is a ‘working’ icon of the spinning circle, it hangs here forever.

Have i missed some file permissions with the move? or something else that needs fixing? it’s not the theme as it’s doing it on any theme.

Any ideas, thanks ??