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[Artemio]

If you catched visual glitch when doing UNDO (ctrl + Z), it might be fixed this way:

1. Run nanoCAD, then call RECOVER command to open the file.
2. Unfreeze, unlock and turn on all layers.
3. Call the command RMPROXY - Nongraphicalproxies to remove proxy objects which do not have a graphic. You can also use XPROXY command to explode visible proxy-entities.
4. Use Purge command to clear waste objects. We also advice to use -PURGE command (works in the command line, without dialog) and use its different options, especially ANnotscales and sorTTable
5. Select all, then call Flatten command. You can do it twice, because some objects can be flattened only the second time.
6. Use Audit command.
7. Use Audit Geometry command twice: first audit z-coordinates, then hatches.

Sometimes it is necessary to repeat steps 3-6 several times to fix the file.
If this is your case, it could be helpful if you send your dwg file to tech support for test.
Also, this steps can be useful in fixing damaged dwg files.