Thanks Romantique Tp. I’m working on this instrument for Yamaha and they got the files to the Halion team. So, it appears that it was a bug with the user velocity curve that I had made for my program. I actually was a little suspicious about that, but I tested it on other programs and it didn’t fail again. But, that may be because the problem has apparently been fixed in version 6.1.10 and I had already updated to that version before testing. So, everyone should update to 6.1.10 and they shouldn’t encounter this problem. In the meantime, the Halion team was able to recover my file and I’m back to work. Excellent! Thanks again!