This is pestering me for more than a month now. Whenever i need to cut or copy objects/vectors, It just won't paste. I had to undo stuff before trying again and again and again and againnnnnnnnnn just to work!! Its not on my hardware i suppose since copy paste outside illustrator is just fine. This bug in illustrator is such a headache that it decreases my efficiency in work by 50%!!!! And im so worried that if Adobe still refuse to fix this bug, I might break my keyboard with all this endless tries of ctrl C and V! And FYI I already tried all those recommended solutions in Adobe community and nothing works!!!!!!!!