I browsed a little and it seems that this is a known problem however I couldn’t find a solution. I am running on XP SP3. If I maximize an audio part editor or a mixer window I can’t adjust their size anymore and I can’t get them on screen simultaneously anymore. I found the only way to restore the original size of the windows is to close the project and re-open it again hoping that it was saved with the windows opened properly. I can’t believe this product is shipped with such a bug.