Hi there - Iâve been running in a 6.1 64bit image for a few days - doing a few experiments at lunch times, debugging things etc. I have had a few infinite loops that Iâve had to Cmd-. Out of and clean up lots of windows (whoever came up with the close all windows to right is a star!). Anyway, I just noticed that now when I drag windows around in the world - they leave lots of window trails around. Redrawing the screen cleans it up - but Iâm wondering what causes this? I tried running the the TimeProfiler and 91% of the time when dragging a window around is in BlockClosure>>newProcess but this doesnât seem out of what with another image that doesnât exhibit this behaviour? Is there something that I should do to clean up? I wondered if I might find some stuck process in the background that was gobbling cpu - but I donât really see that (but is there an easy way to check?). Tim