(Example: I added the execute command (Go) but I can't execute the program.)
Check to see if the "open bracket indicator" is blinking as shown below.
Try adding "]" to the command line window to terminate the blinking "open bracket indicator".
The "open bracket indicator" blinks when "[" is input to the command line window. In this case, the commands that are input while the indicator is blinking are held until the indicator goes off, and then executed.