Expected Results: When an expression type is selected in an NSPredicateEditor row template in IB, it stays selected and isn’t changed by adding another item.  The items all have the same type in XML, as suggested by the interface in IB.

Actual Results: The type wanders back to “Constant Values” on its own.  Different items have different types in the XML.  There’s no way to fix this in IB, but manually editing the XML makes it compile and run just fine.