Upgrader Beware: Be extra careful when moving folders from one physical volume to another when using Leopard. If for some reason the destination volume disappears (like its an external USB drive, and your klutzy brother trips over the cord and disconnects it while the folder is being moved), you’re going to lose data in a big way. Leopard’s Finder has carried over this major bug, which apparently harks back from Panther, according to blogger Tom Karpik.

Video evidence taped by Mr. Karpik here.