@C_R 

I have tried to "restart Maple server" and after some time in use, it still freeze. When it freeze the left corner is just empty, and i cant close Maple again without restarting. If i just let it run, Maple would turn into black screen.

@Preben Alsholm 

It just happen when i use it over longer time, i can do all things like 2+2 but when i used it for some time, it just freez. I cant do anything when it freez, i cant even close it.