Scenes won't change

I have a problem that changes I make to a scene in DS are not effected in Reality and not present in Luxrender. I can change materials in DS, move the camera in DS, move objects in DS, and Reality uploads some old scene into Luxrender.
Obviously I change both the image and scene file in Reality with every new render. I've tried saving DS, closing Reality, and I can't find a pattern to it. Sometimes Reality renders the scene as I see it in DS, and sometimes it gets stuck and I keep rendering old scenes that are absolutely nothing like what I see on my screen.
E.g. Loaded, The Ballroom, added a light, rendered. Fine. Noticed the doorhandles were emitting light, fixed that in Reality, re-rendered. Had to faff around for ages before Reality would output the correct version to Luxrender. Changed the Ballroom to use the Bal a Versailles textures. Reality not only ignored this, it went back to the old material set with the luminous doorhandles. That scene didn't even exist in DS - it was clearly cached in Reality.
On a couple of occasions Reality has merged an old scene with a ghostly new scene, like a film double exposed.
Reality would appear to have a synchronisation problem.
Otherwise, I like it. Shame I've spent 75% of my time with this problem.
Valkeerie
Comments
...do you have Reality overwrite the old version when processing the updated one?
Yes. I assume you mean the dialog after hitting "Render" where it asks if you want to overwrite. I've done that, or conversely used new filenames. Doesn't make a difference - still gets stuck on some old scene.
Valkeerie
the camera should change on the overwrite but check to see if the surfaces are changing in the Reality interface when you make the adjustments in Studio and GO BACk into the Reality interface.
I've seen this in happen R2.5 but I have not had a chance to test out R4 yet.