Commands failing when using space bar to rerun

when spacebar is used to rerun commands (scale and rotate are the ones I have run into problems with so far), the command will not execute. The command window opens and appears to work, but when I change the and of the options or try to execute the command, nothing happens. I have to exit the command and run it from the icon or menu.

It appears that the escape button will execute the command. But OK, right click, space bar and enter button do nothing.