What causes this condition? I normally use BIAB on a 500gb HD back up. I also, sometimes use the lap top org.. Song files are saved to a dedicated folder on the same USB HD. Such as COUNTRY-----2013, JAZZ & SWING----2013. Two days ago I noticed playback issues. Example: if using the C drive BB, Alley Cat saved & frozen in C would open in D? The melody is Midi piano, while the band is RealTracks. The band plays back in D (although saved in C) while the Midi melody plays back in ?. Note that this is if the laptop version of BIAB 2013 everything pak is used. The same song file, from the same folder plays back fine if the USB HD is used. Sending that same file to an SD card, reopened ,had the same results. To un freeze and resave in C made no difference. I keep my finished songs on the 500gb HD plus backup on a 16gb SD card. So, the songs always open from the 500gb HD. Of the songs I tried, if they had a Midi melody and played back from the laptop BB, they were messed up. If they were RealTracks, no problem. A reset to factory settings made no difference. A reset to a previous setting solved the problem. It was resolved with out a solution. What did I do to cause this? -----Leon