This might be a server issue, but i just tried to copy a file from a connected file server to my desktop via drag and drop, and it deleted the file from both the source and destination location! I'm quite certain I didn't do anything like drag to recycle bin or anything like that... but has anyone ever heard of this situation before? In general dragging files from this server to the desktop generally initiates a file copy operation, but in this case the file simply disappeared. Its got me paranoid because I've essentially had this file delete itself twice now, and I'm feeling awful asking my coworker to keep attempting to place the file on the server. For interest, the file was a large 700mb collada (3d exchange format). Preview is able to open these type of files, and it appeared to be attempting to generate a preview within finder right before the file disappeared. Could preview have crashed from its size and somehow taken the file with it??