Have been using LR3 for around a year and no problems. Suddenly working in the wee small hours on a photo shoot, my basic panel disappeared. Tried everything I could think of to get it back but no luck. Noted that that i could get some of the functions back by hovering over parts of the histogram. Weird. So I finished my shoot and got the photos online but it's just to late to try and solve the problem. I give up for now! Any suggestions welcome! Thanks!