Hi,
I do have an update for using that little line of code. Do it only after you detect a MouseButton, otherwise it will really bog down your code. When I reported my happy results it was after a detection of a mousebutton that I applied the "clear". I got tired of placing it in so many places so I tried it right after the WHILE _MOUSEINPUT: WEND. That's when the code really bogged down, so I added an IF mb1 (mouse button detection) then the "clear" and now it works well with only the one time placement.