I've been using LR for years, and just upgraded to LR 4.1 to go with my new Lion OS X System, and a new Mac laptop. I imported hundreds of photos from a Peru trip, a family outing, and then hundreds from a Dominican Republic trip. The third day of the trip, I opened up LR, and noticed some of the photos I had been looking for the previous day had question marks. So, I did some checking, found the majority of photos since Peru were missing. Looking at my hard drive, I found that almost every photo was gone, except in many folders (set up by date) there might be anywhere from two to 10 photos still in the folder. That means that there was no way it was user error, I would have had to go in by hand and select from different folders. I knew they were there the day before. The only thing that happened between looking at them one day, and the next, was that another software program was trying to render video and ran out of disk space. Other than that, I didn't touch the files.
I've tried everything, to no avail. Those images are long gone, forever. I hoped it was a one time event, but today I went looking for about a hundred photos I took about a month ago, after all those trips. Guess what? Random disappearance of almost everyone of the photos. Now I'm really worried. I have no idea what to do. Can anyone tell me what's going on? I saw a thread about a similar issue that was put up online in 2009, but that doesn't help.
I hope someone out there has heard of this, and knows what's happening.