Good on you developers, always got to upset something with your SP updates. You have turned saving, zooming in and out into a line world gone mad. Zoom in or out does get rid of the lines but then you only see parts of an entity. Several ways to eliminate the lines and get back to normal but very annoying to say the least as it happens continuously. Please fix this problem as it never existed in any previous versions. I dare say I am not the only one with this issues that comes with SP2 update.