was the "previous version" made with the same version of the serialization library?
As I mentioned, the both versions were built with boost 1.47.
What are the differences? If the previous version didn't serialize via a pointer and the current one does, this could happen. Otherwise I wouldn't expect this.
The serialization code didn't change at all. In the both versions it serializes the structure I described in the previous message. The classes changed a bit, but I can't realise how it could affect the serialization. The xml item made by the previous version look like this: <item> <which>5</which> <value class_id="64" tracking_level="0" version="1"> <px class_id="65" tracking_level="1" version="0" object_id="_116"> <info>etc... The same item from an archive made by the new version: <item> <which>5</which> <value class_id="84" tracking_level="0" version="1"> <px class_id="85" tracking_level="1" version="0" object_id="_84"> <info>etc... When it comes to <px class_id="65"...>, i.e. to the raw ptr within the shared_ptr<>, it can't find the class.