ok... i was testing a little and i think i know what the problem is.... the player supports any number of songs and/or albums, but the software only takes 255 songs total (it transfers more, but it only shows the first 255), so if you put more that that, you will be able to listen to them on the player, but you won't be able to modify them on the software because they just won't show up (so you can't move them up/down, erase them, bring them back to your hdd, etc.) i don't know about coding but i hope this helps to solve the issue... maybe you didn't put the limit of 255, but it was on java by default... i saw another software similar to this with a similar bug (voidmp3fm), that later on they fixed putting a higher limit manually on the software...