I used the automatic build script:

  geant -b $EIFFEL_SRC/scripts/build.eant build_es

I first cleaned everything in sight (targets clean_es, clean_finish_freezing, etc).
I then renamed the EiffelXX directory that was created and pointed
my ISE_EIFFEL environment variable to it (in a script which sets up
my Eiffel environment, including changing PATH variable).  
I'm not at home so I can't be certain but I believe
I was using the ecdbgd executable created by the automatic build script
(and I'm assuming this build script did in fact recompile and relink
ecdbgd).

Perhaps we should just leave this open until the next official build
comes out.  I will then test this to see whether it is fixed (and if it
is, there must be something wrong with the automatic build script or the
way I invoked it).