I commonly need to create a slideshow that has the filename in the image and then export. I use the Slideshow feature and then instead of export as pdf I choose export as jpg. I just bought a new computer and have installed all of my normal Apps. Lightroom is working just fine but when I try to export either as pdf or jpg the save screen freezes. I can not give it a file name or choose common sizes. I have to quit the program. I have uninstalled the app and reinstalled with the same problem, Any ideas.
Are all the photos available when you go to export?
Yes. They are all on the harddrive
I'd be inclined to reset preferences as my first option with issues like this. Hold down Shift and ALT (Option) as you restart Lightroom, then reset preferences.