Not sure what's missing, but I think you can get to the bottom of it if you haven't already.
When you do get that error, immediately go to the object spy and look at the properties of the object in question. If you truly have ONLY start row and start column used to ID fields, I'm not sure what could be the issue. Did you remove the other test object details? If not, that may be the issue. Turn Ordinal identifier to None and make sure if you are in qtp11 that the Visual relation identifier settings are alson None.
When you do get that error, immediately go to the object spy and look at the properties of the object in question. If you truly have ONLY start row and start column used to ID fields, I'm not sure what could be the issue. Did you remove the other test object details? If not, that may be the issue. Turn Ordinal identifier to None and make sure if you are in qtp11 that the Visual relation identifier settings are alson None.