InCopy exports have to be made from an INDD file. An INDB file is nothing but a database of which INDD files are in the book.
That said, incorrect page numbering in assignments was a bug in a some older versions of InCopy but I think it was fixed in CS4.
Thanks. I appreciate the quick response. I will forward to my designer.
Our editors are using InCopy 5.5. I will ask my designer how she is opening the separate indd files within the indb. Perhaps that has something to do with it.