With all hints selected for Python in Editor preferences, when a parent/child circular redundancy hint is displayed,
then another python file is opened and a hint is shown then the hint for the C/P circular redundancy is removed.  

Steps:
Make sure all hints are enabled for the Python Editor
Add a circular redundancy like:

    class A(B):
        def __init__(self):
            self._myprotected="protected"
    class B(A)
        pass

The hint should show at classB(A), place cursor on this line
Open another python file from another project and add 2-6 so that assign expression to variable hint will show
Switch back to file w/ the redundancy and it is no longer there.

System:
Build 582
Product Version: NetBeans IDE Dev (Build 20090112145108)
Java: 1.5.0_16; Java HotSpot(TM) Client VM 1.5.0_16-133
System: Mac OS X version 10.5.5 running on i386; MacRoman; en_US (nb)