For the longest time I have been able to save all my Sonar files on a CDR or DVDR with no problems, i.e., I can reopen the files from disc and everything is there as it should be. Just recently I reopened a couple different files from a DVDR and my drum loops were replaced by other audio files. Only the drum loops. That seems odd to me. The bun files are supposed to keep everything exactly as you saved it. Anyone have some help on this?