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>> If the value of the pointer at deallocate time is still the same as what was returned from the initial allocate, what else about it can be corrupted? 1) Have you moved (or in any way "touched" the pointer in such a way as it could have been invalidated? The content would appear the same but the tag bit would have been turned off rendering it useless as a pointer. 2) Did you do a realloc and fail to store the new pointer (i.e are you attempting to free using the original pointer when the realloc may have changed it? Jon Paris Partner400
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