I am used to using the space bar as a return from years of using the windows version. In the Mac version this does not seem to work consistently. For instance in the Loft command, if you initiate the command and select the two lines you are lofting between, in windows you would then hit the space bar to confirm and execute the command. In Mac, the “Rebuild with” dialog is acitve by default and pressing the space bar replaces the default value, even though this option is not even selected.
Not sure if this is a loft problem or a general use of the space bar problem.