I have tried searching the net for a solution but I haven't come across this exact problem. When I open Ubuntu Software in 16.04 I see the "featured applications" "editors picks" "recommended" and "categories" But when I select any application nothing loads. I get the orange circle that keeps rotating and nothing ever happens, nothing ever loads.
The ONLY thing that temporarily solved this problem was:
$ killall gnome-software $ rm -r ~/.local/share/gnome-software
Once I ran the above everything loaded correctly in Ubuntu Software but it only lasted a few hours and eventually went back to the same old orange circle of death on everything I clicked.
Please help if you can :)