Hello. Excuse my bad english. I already have Photoshop CS3 in my computer and it has never been a problem to open pictures from Lightroom into Photoshop CS3 before. But since I installed Photoshop Elements also Photoshop CS3 don´t com up as a choise in Lightroom anymore. I have tryed to take Elements away but it won´t help.
Have you tried setting up CS3 under the additional editor? Go to:
Edit >> Preferences >> External Editing (tab)
Lightroom >> Preferences >> External Editing (tab)on Mac OX
Click the choose button and navigate to the CS3 application and select it.