In globalDefinitions.cpp from the first day T_ADDRESS size is defined as 'int' size:

int type2aelembytes[T_CONFLICT+1] = {
...
  T_OBJECT_aelem_bytes,   // T_OBJECT   = 12,
  T_ARRAY_aelem_bytes,    // T_ARRAY    = 13,
  0,                      // T_VOID     = 14,
  T_INT_aelem_bytes,      // T_ADDRESS  = 15,   
  0                       // T_CONFLICT = 16,
};

I think, this is because T_OBJECT_aelem_bytes was also 4 when it was created.
T_OBJECT and T_ARRAY sizes were fixed when VM was changed to support 64 bits oops.

The incorrect T_ADDRESS size in 64-bits VM produces whong size of StoreP nodes
attached to Initialize:

  virtual int memory_size() const { return type2aelembytes[memory_type()]; }

As result EA can't find stores through Initialize node.
The current code which use InitializeNode::find_captured_store() may also be broken. 
I think, it works now because LoadP and StoreP has the same T_ADDRESS type.