I tried to start it twice. Here is the system log:
Call location:
Aug 19 11:37:32 Michaels-MacBook-Pro.local AutoCAD LT 2013[2802]: 0 CarbonCore 0x00007fff89dae2b7 ___Gestalt_SystemVersion_block_invoke + 113
Aug 19 11:37:32 Michaels-MacBook-Pro.local AutoCAD LT 2013[2802]: 1 libdispatch.dylib 0x00007fff89ac9c13 _dispatch_client_callout + 8
Aug 19 11:37:32 Michaels-MacBook-Pro.local AutoCAD LT 2013[2802]: 2 libdispatch.dylib 0x00007fff89ac9b26 dispatch_once_f + 117
Aug 19 11:37:32 Michaels-MacBook-Pro.local AutoCAD LT 2013[2802]: 3 CarbonCore 0x00007fff89d37456 _Gestalt_SystemVersion + 987
Aug 19 11:37:32 Michaels-MacBook-Pro.local AutoCAD LT 2013[2802]: 4 CarbonCore 0x00007fff89d366e3 Gestalt + 144
Aug 19 11:37:32 Michaels-MacBook-Pro.local AutoCAD LT 2013[2802]: 5 QtCore 0x0000000107203f96 _Z15qt_error_stringi + 742
Aug 19 11:37:32 Michaels-MacBook-Pro.local AutoCAD LT 2013[2802]: 6 ??? 0x00007fff6d922d0b 0x0 + 140735031684363
Aug 19 11:38:10 Michaels-MacBook-Pro.local AutoCAD LT 2013[2844]: WARNING: The Gestalt selector gestaltSystemVersion is returning 10.9.5 instead of 10.10.5. Use NSProcessInfo's operatingSystemVersion property to get correct system version number.
Call location:
Aug 19 11:38:10 Michaels-MacBook-Pro.local AutoCAD LT 2013[2844]: 0 CarbonCore 0x00007fff89dae2b7 ___Gestalt_SystemVersion_block_invoke + 113
Aug 19 11:38:10 Michaels-MacBook-Pro.local AutoCAD LT 2013[2844]: 1 libdispatch.dylib 0x00007fff89ac9c13 _dispatch_client_callout + 8
Aug 19 11:38:10 Michaels-MacBook-Pro.local AutoCAD LT 2013[2844]: 2 libdispatch.dylib 0x00007fff89ac9b26 dispatch_once_f + 117
Aug 19 11:38:10 Michaels-MacBook-Pro.local AutoCAD LT 2013[2844]: 3 CarbonCore 0x00007fff89d37456 _Gestalt_SystemVersion + 987
Aug 19 11:38:10 Michaels-MacBook-Pro.local AutoCAD LT 2013[2844]: 4 CarbonCore 0x00007fff89d366e3 Gestalt + 144
Aug 19 11:38:10 Michaels-MacBook-Pro.local AutoCAD LT 2013[2844]: 5 QtCore 0x0000000107203f96 _Z15qt_error_stringi + 742
Aug 19 11:38:10 Michaels-MacBook-Pro.local AutoCAD LT 2013[2844]: 6 ??? 0x00007fff5fd19d0b 0x0 + 140734800960779
