Robert, My app is hitting the assertion at line 133 in basic_text_oarchive.hpp with delimiter = 3 when serializing to a text_oarchive. The assertion occurs during serialization of the count for a shared_ptr. There is an access violation when attempting to serialize to a binary_oarchive also. XML serialization in both directions works fine. The odd thing is, if I comment out any usage of xml_oarchive, the assertion is not triggered, and serialization to both text_oarchive and binary_oarchive succeeds. Input from binary/text/xml succeeds in all cases. I'll try to diagnose further. This is all with vc7.1, both the exe and libs are compiled with static multi-threading library flags (/MT). Any thoughts? A quick perusal of the test suite doesn't show any cases using multiple oarchive types within a single test. Thanks, ----------------- Jeff Flinn Applied Dynamics, International