Some suggestions: Might there be a layer that is obscuring the code from the CU7 update on one of the objects involved? Maybe there is a higher layer (VAR, CUS, USR, etc..) on the object which hides the CU7 code. You can use the compare tool to check on the different layers.
Another option can be that you need an incremental compile on some classes if the code shown is correct but you still receive errors.