Elements 8 Organiser won't load Photoshop CS5 as external editor

Question

For some years I've succesfully used Photoshop CS2 with Elements (various versions) Organiser as my photo file manager.  The Organiser allowed me to select Photoshop as the external editor and subsequently accepted/managed the edited photos from Photoshop when I closed the file there.  (I prefer the facilities of Organiser to those of Bridge; and other folk in the household prefer Elements Editor).
I recently upgraded from Photoshop CS2 to CS5 64bit.  Initially Elements 8 Organiser (which is 32bit) continued to call up Photoshop (CS5) as the external editor but has now ceased to do so.  There is still an option in Organiser's dropdown EDIT list to "Edit in Photoshop" and any thumbnails selected in the Organiser get the "being edited" label applied if I select the "Edit with Photoshop" option.  However, Photoshop does not open;  or, if I have Photoshop open already, the photos selected in Organiser do not appear in the Photoshop workspace for editing.
I cannot, either, find the "close external edit" option in Organiser. When I eventually close Organiser, it warns that I will lose any editing done with the external editor to those photos it thinks it has handed to Photoshop, even though there has not been any handover in fact.
I can chose, in Organiser, to edit the very same photos with Elements Editor, even though Organiser appears to think that they are currently being edited by Photoshop.  If I do edit such a photo in Elements Editor then close it, the Organiser becomes happy and forgets it thought Photoshop was involved at all.
Is there some switch in a config file somewhere that I can throw to get the Organiser to actually call up Photoshop and hand it the file(s)?  Or is this just an Adobe glitch?  Any help or clues would be much appreciated.
Lataxe

Answer 1

Graham,
I have tried to persuade Elements Organiser to reconsider Photoshop as an external editor by going to the "Editing" section of Elements Preferences dialogues and specifying Photoshop.exe.  However, no matter which version of Photoshop.exe I point at (64bit CS5, 32bit CS5 or even the old 32bit CS2) Elements tells me that it automatically already has Photoshop as an external editor and I don't need to specify it as such.
On trying to exit the Preferences/Editing dialogue, Elements then pops up another dialogue box that tells me that "The path you chose for the external editing application is invalid.  Please correct the path or choose another external editor".  I need to uncheck the "Use a supplementary editing application" to stop this box re-popping.
The Elements EDIT drop down menu still shows Photoshop as an available editing application.  However, as described in the original post, Photoshop does not load or pick up any file specified for Photoshop editing within Elements Organiser.
I've also tried resetting Elements Organiser Preferences to their default.  This does not make any difference to the problem either.  There is an Organiser glitch I think.  I am begining to think it will need a Registry fix ..... but of what I have no real idea; and it isn't a good idea to mess with the Registry in a haphazard way.
Perhaps I should try a reload of Elements from scratch, after saving my Catalogue file somewhere safe?