I just checked, it doesn't make a difference. I tested with many more mp3s and I found some that can be added to the layout screen consistently, although for the life of me I can't understand the difference between files that are ok and files that freeze ImgBurn. For example, I have two tracks that were encoded with the same settings and the same library, and both play fine in many media players. They are both 44100 Hz, 224Kbps, CBR, I have removed all tags from them, there are no special characters in their filenames and both filenames are a single word. Yet, one will always add without problems while the other will always freeze ImgBurn. Everything is ok with WMA or OGG files. I should also mention that if I drag 'n' drop then when ImgBurn freezes, the File Explorer freezes too.