[quote user="Paul Connelly"]To follow up...56ff0001 indicates a visible ECInstance associated with an external schema.
Make sure you have registered your schema with ECObjects so that it can be found; if we can't find the schema, we can't read (or show) your ECInstances.[/quote]
Well, the may explain why it's not showing (external schema), but it *should* be the same schema as the one that IS showing. What is the difference between an "internal" and "external" schema? Does a HandlerId of "0x56ff000" indicate an "internal" schema? This data was attached/inserted by myself, not using ECObjects. It was/is all being done via the XML Instance API in C++.
This data was "copied" by my tool from a different .dgn file/model. I need to go back to the source data and see if this is a "pre-exisitng" issue (the different HandlerID's).