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> The fault is at
> line 258 in ltable.c (in luaH_set):
>       while (othern->next != mp) othern = othern->next;  /* find previous */
> othern is NULL. mp->key is also all zeros.

That is strange. mp->key shouldn't be all zeros (if the tag is zero, the
value should be a valid TString pointer).

> My guess is that I am causing Lua to attempt to
> access an already-deleted C++ pointer

The only place where Lua accesses "user" pointers is when calling C 
functions, but it is not common to delete them. Lua never accesses an 
userdata (I hope). 

-- Roberto