2 years.. not i mean it takes such time just to tag those files, but it was 2 years ago when I started to tag those mp3's properly, such as album art, composer(if any), etc.
after some recheck the cause is identified. It was replay gain(scan per-file track gain) that cause foobar to wipe my whole tag.
Yeah, I do some gain analysis to normalize the volume. But why remove whole tag? why don't just update the gain correction metadata like other player?
On some of my file it still randomly leave some important info such as artist or song title or both of them, while on other file it completely remove the tagging information.
I'm using audioshell as my mp3 tagger though.