Hey guys I'm quite a problem with LR3 and CS4 and I wanted to see if it has happened to anyone else.

Problem is this: I stack similar images together in my LR catalog. SOme are different edit version etc. When I select a version I want to export in to CS4 using the 'Edit in...) command all is well until....

CS4 opens and sometimes it open a different image from the one I selected. Sometimes an image from a different stack even. When it does open the correct image and I do my frame and watermarking and then hit "save".
I go back into LR, where you would expect it to refresh iwith the newly saved image as a copy on the stack) - but the new image isn't there, an sometimes it has added some other random image to your stack> Argh, it's doing my head in. Its as though its getting the paths to the images mixed up and putting them in different stacks. Am I doing something wrong or could this be a bug?