Are your Alt & function keys working seperately? Try Pressing F11 key only and see if it create a chart sheet or not? Also try Alt key to activate menu.
For the information of further people having the same issue, I think the only reason that can cause it is that another program interferes with the shortcut.
In my case, it was nVidia ShadowPlay. I had to close all nVidia running processes and it worked again.