V. 3.29 Introduced Microsoft Media Player Errors For Me

[LyricsLover]

@coljediv

As a side note, Windows Media Player seems to play the resulting MP3 files OK, just not the FLAC files.

The format MP3 seems not to have the same limit for embedded cover artwork.

@coljediv

I'm not sure how to effectively check the artwork size embedded in the file

You can view a selected music file in Mp3tag's lower left cover art panel and the size displayed like this:

If the size is ~16MB this could be the cause.

You can easily test it:
Reduce the resolution of such a big cover art in a sample music file to a lower value, save the change and see if it plays fine in Windows Media Player.