I have been using Lightroom for the past year and have not come across the problem until now. I created a preset for a set of images and applied it to the batch. I was able to edit the caption of the first half of the images, but not anymore. I tried to edit other images in my Lightroom catalog and the same thing happened. The caption reverts to the preset caption. I am not able to save the edits (it only saves the preset). I'm working with jpegs imported from Dropbox which is synced to my Desktop.