Hi all, I am fair new on the forum so my apologies if I make a mistake. I have a Mac book Pro and I am using Lightroom 3.6 to edit my pictures. A couple of days ago, I have realized that the current catalog I as working on disappeared (with all the editing I have done and all the presets I saved) to return to an old catalog I had when I purchase the software, and which is empty. I have located the .lrcat file on my computer but this is the one of this new/old catalog. I cannot find the one I have used the past 6months. I am using both my computer and external drive so I have all my raw picture but all the editing disappeared...and it is a lot of work. I don't think I did something wrong with the program, just used the usual features. My computer did not crash. It is just a big mystery. Did it happen to anyone? Any idea how I could come back to an earlier version of the program (I have not used time machine unfortunately). Thousands thanks in advance!