The latest test pilot updates include a massive recompilation (moving 'subclasses' down from ClassDescription to Class) that takes 4 minutes on a Mac G3.  You may get a warning regarding obsolete classes in your system prior to this process.  Do not despair -- you should be able to proceed right through it.  It is most likely due to obsolete flaps (this is the case with a vanilla 2.4 image).  The obsolete classes can be eliminated either before or after the update process by executing...

	Utilities clobberFlapTabList

(Caution: do not try to pronounce this ;-).

Carry on.

	- Dan