In Polyphone 1.9, I sometimes encountered a really annoying bug that messes up my samples.Specifically, after I saved the soundfont few times, some of my samples went blank (literally had zero signal) and I had to export the soundfont instead of saving to temporarily solve this issue.I wonder if anyone else encounters this bug or it's either already fixed in newest version because I haven't switched to 2.2 yet.
I don't know about this kind of bug inside Polyphone, but I can assure you that the latest version is working fine. I have a soundfont I'm working on for more than 6 months, saving new changes on an almost daily basis, and never had a problem...
Try updating your Polyphone, if you still have problems, then bring them here