This sounds very similar to the problem that I am having with AutoCAD 2013 LT on Yosemite. Drawings just instantaneously disappear from the screen, AutoCAD doesn't 'crash' exactly, drop-down menus appear but are useless. The only way out is to force quit. When restarting the option to recover drawings appears but recovered drawings are very old and missing most (all?) of the changes since last save.

I have exactly the same problem. It occurs when I draw a construction line and edit the line arount it for instance. WEIRD.

Do you have any solotion?

I am having the same problem - the drawing just suddenly disappears and I have to force quit Autocad to get any response. When re-opening the file, all edits since my last save are lost.

Almost any action can provoke it - selecting a line or hatch pattern, stretching, deleting, etc. Crashes occur frequently sometimes (after only a minute or two), at long intervals at other times (well over an hour). I can't see any pattern suggesting why this variation occurs.

I have tried uninstalling Autocad (which required downloading and installing trial 2015 version first, then uninstalling that), then downloading the latest version of 2013 and reinstalling it, with no improvement. 

Hi Maxim

Many of my drawings are based on site surveys etc. sourced from others, and are often composites from several sources. I am a landscape architect and projects always involve modification of sites, not building new ones scratch, so the drawing process mirrors that principle.

Most of the source drawings have probably been prepared in Windows systems (I assume). In general I copy info from those files into new drawing files created from templates on my Mac, rather than simply copying the original file and editing/adding to that.

(BTW, I have found that it is necessary to reset SCALELISTEDIT to clear out multiple scale settings that are brought into files this way, and which can significantly increase file sizes.)

The crashing is only obvious on larger files that have involved more cutting and pasting from other sources, rather than small new files - but I can't tell whether that is because the new small ones are actually more stable, or because I spend almost all of my drawing time on more time on the larger, more complex files.

The problem only began to occur after upgrading to OS X (and began almost immediately after upgrading). Autocad was always very stable on my Mac before that.

Ron

Yes, I kept my preferences when removing and updating AutoCAD. No, I haven't tried resetting via the application tab.

Will try that and see if it makes any difference.

Thanks