But no, we have to spend hours or a day or two frantically searching around while a project deadline rushes towards us. You would think that Symantec could be a little bit helpful by advising AutoCAD users (surely they can examine client systems and see if AutoCAD is installed) that they have a fix available on their site. There is a difficulty of some sort in 360 ver 3 for systems with AutoCAD installed. But I have found that the problem is in Symantec-Norton 360 version 3.0. Thank you gentlemen (and ladies?) for your suggestions. All other apps on my system behave perfectly well, including Word and Excel 2007, Photoshop Elements 7, etc. 1GHz RAM (yes, I know that's not much these days but it worked OK before). Same everything as when Acad was saving without any trouble. I should add that my operating system is XP with all the service packs and updates, running on a pretty standard Prescott 3GHz machine. But you guys know the answer, don't you? My Autodesk dealer is puzzled and can't offer any good ideas. I have allowed my annual subscription to lapse (Oct 2008, due to retirement soon) so I haven't approached Autodesk support. Both of these programs are properly licensed of course. As my immediate job is a simple one I cranked up my old AutoCAD LT 2004 but I find that it too refuses to save in the same way as Map 3D 2009. Strangely, clicking on the Save icon in AutoCAD will save the drawing (to its original location) without a hang. Windows Task Manager reports that AutoCAD is "not responding" which is pretty obvious, so I close it using Task Manager. This happens when I use command line save, or saveas, or File menu, Save as etc. I found that my AutoCAD Map 3D 2009 has suddenly decided to hang (and not save) when I try to save my drawing.