I have asked this question before (2008) but no one answered. I just repeated my error and am still flummoxedflummoxed.
In early versions of Maple (Maple 1 Maple 3) one could halt a computation on the Mac by holding down the command key and the period; Maple would respond quickly. Now one can try that or click on the red hand in the tool bar and interrupt the computation but it doen not necessarily stop.
I inserted a print command in a procedure so that I culd verify it did what I wanted. When it worked I used that procedure in a do loop, forgetting to comment out the print command and filling the screen with unnecessary output. No way to stop and no mention of this in the documentation that I could find. Any suggestions?