Oh. I think I figured it out. I had a bgm file still open and paused in Windows Media Player. I presume that YATA+ LITE always puts its temporary bgm file in the same place
EDIT: Yup. That was definitely it.
Yep, that's why i don't recommend the lite version, it's only for who doesn't want to install windows media player, if you have it installed you should not use the lite version, because the "standard" version doesn't have these kind of problems