The following isn't very important but I wanted to ask out of interest. The window design layout inside of WPS Office looks a bit old-fashioned. I haven't checked all other programmes but to me it seems that all other programmes have the normal Unity style.
Any idea what that could be or how to investigate this issue further. I tend to believe that before my Ubuntu crashed and I reinstalled it, the windows were in normal Unity layout. It's not only the buttons but also the mouse cursor is black instead of white and the loading-up mouse cursor is the super old black watch not the white spinning Unity circle.
Any ideas, please let me know.