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Firstly thanks for all your help on previous questions. On most occasions, when closing a dwg file with other dwg files still open, a dialog box will open saying ‘non responsive program, autocad must close’. The remaining open files losing any work on them done since I last hit save ( i thought when it opens in recovery mode the recovered files would be saved to within 10 minutes of the crashed application as that’s what the AC settings are set to). Autodesk tech support asked me to move the dwg files off the server to see if the problem persists. So far so good but its only been 2 days. And ideally the files must be on the server. (IT recently renewed the server. The problem was also there before however). Another problem I’ve had is a slow response ( 5 to 20 seconds ) when making certain commands, in particular switching between model space and paper space (even with files on the local drive). Zooming in and out also seriously labours AC (but not with all files I work with). Having also mentioned the above to Autodesk support it was suggested that we temporarily disable the security and observe the response. Something of note, I’ve clicked the performance settings tab which opens the performance tuning dialog which has the enable hardware acceleration checked. ( autocad notes that my graphics card is unknown, and to run hardware acceleration at your own risk). When I hit the ‘check for updates’ button another window opens saying ‘a newer version of the graphics card and driver database that is used for performance tuning is available’. Clicking the yes button brings up yet another window which reads “ performance tuner failed to update. Please check your network connection and make sure you have write permission to the file” Its a steep learning curve for me and may well result in realising some incorrect settings or practices I have with the program. I appreciate your input here, if you can think of anything to add. What else should I trial? Etc...