I am having the same issue. I have done a recovery of the file and everything says its ok.
Drawing recovery.
Drawing recovery log.
Validating objects in the handle table.
Valid objects 1113573 Invalid objects 0
Validating objects completed.
Salvaged database from drawing.
Loading Modeler DLLs.
Auditing Header
Auditing Tables
Auditing Entities Pass 1
Pass 1 1113500 objects audited
Auditing Entities Pass 2
Pass 2 1113500 objects audited
Auditing Blocks
1153 Blocks audited
Total errors found 0 fixed 0
Erased 0 objects
Opening an AutoCAD LT 2007/AutoCAD 2007 format file.
Substituting [SIMPLEX.SHX] for [WORKING.shx].
Substituting [SIMPLEX.SHX] for [SIMSLASH.SHX].
Regenerating model.
Once it tries to regenerate the model, it gives me a fatal error message.
FATAL ERROR: Unhandled Access Violation Reading 0x0000 Exception at 5823ad0eh
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