When you say "moves across the portion of SE" - do you mean that part of the slickedit window is actually visible or is it completely obscured by Safari etc?
In tools -> options -> appearance -> preview tool window, you could try turning off "activate preview tool window from other windows" , if it's on. Also in tools -> options -> appearance -> tool windows, select the "options" tab and enable "hide when application is inactive" - see if that helps. Can you minimize windows on a MAC? - if so, does slick still steal the focus if it's minimised? Another thing to try is in "application options" -> notifications - turn on "disable all popups".