I am trying to use the boost serialization library to save an objects from a class heiarchy. I keep running into a stream error when deserializing a pointer from an xml archive. I have everything registered (that took a while, but I have that problem figured out, I think), and the serialization to an xml archive seems to work just fine. I have stepped through the deep nesting of calls to the exception and it is being thrown because the stream says it is bad when trying to read the end tag. I also tried it with text archives, and I get the same problem. I have done the obvious (to me at least) things such as class export/registration, us std::ios::binary for output/input stream instances. Any advice on how to track down this problem with a stream error? I have gone back to first principles with a simple example and that all seems to work. So it is obviously user error. I am trying to understand what is wrong with my more involved case. I appreciate any advice someone could give me.) Thanks, Phil