LMS 7.9 refuses to pick up my new batch of music

I have used LMS for years. While scanning would have certain problems every now and then, this is the most troubling one I have experienced yet.

I just wiped my NAS and re-installed LMS and re-transferred my library of music into the NAS. Everything is done fresh and I did not import any db or settings. LMS scanned and I got all my music. Added a batch of music later in the week (all flacs with full metadata, organized in artist/album/tracks folder structure). New tracks did not turn up. Then, I tried the usual suspects.

1. Did rescan everything. The whole library turned up again but not those new tracks
2. deleted cache.db and rescanned. Same results
3. Re-save those files using mp3tag and rescan. Same
4. Deliberately changing the metadata by adding a 0 to the album names and re-save, then rescan. Same
5. Copying those files to another location on the NAS, deleted the original files, re-save the files using MP3tag, and moving those files back into my media folder. Same thing.

I will probably save and re-save those files with another computer (hopefully changing certain metadata and date stamps such that LMS may see them) and replace the files in my NAS with them and see how things go. Other than that, any other suggestions?

Thanks.