Why can't I drag and drop in El Capitan?

[iMore Question]

I now cannot drag and drop files or folders in El Capitan. I can only "copy and paste". Any files or folders I try to D&D appear on my desktop (??)

 

[Ariel Babalao]

What about installing "total finder"? It cure most of those issues for me specially the cut and paste and drag and drop as well.