[DoodleNoodlePoodle]

It sounds like OP has this sorted, but in case anyone else wants to recursively remove cover art from their FLAC files, and uses a UNIX-like system, the following commands have worked for me. Assumes find and metaflac are available.

Code:

find /path/to/music/ -type f -name "*.flac" -exec metaflac --remove --block-type=PICTURE,PADDING --dont-use-padding "{}" \;
find /path/to/music/ -type f -name "*.flac" -exec metaflac --remove-tag=COVERART  --dont-use-padding "{}" \;

Adapted from https://superuser.com/questions/1649085/...flac-files

Note this will be pretty time consuming for a large library. And while I haven't had any issues, I'd recommend making a backup first just in case. Also I haven't tested the resulting flac files with a Tangara yet. I will try to remember to update this when I receive mine.