I went to remove songs from a playlist and accidentally selected remove from hard drive as well -- the program began deleting all of my music on my computer. Luckily I was able to retrieve the thousands of files from the recycle bin, but this could have been disastrous had I not been able to (thousands of dollars of music, and many of the files I no longer have hard copy CDs of). An easy solution would be a pop-up warning asking "Are you sure you want to delete all of these files from your computer?"
This is the only major complaint I have. Thanks for this great program!