Problem with OGGvorbis

[hamsen]

I have 2 problems concerning OGGvorbis:

1) RightClick ogg-file, edit tag, add albumart.
The image selected is accepted, but it's never written to the file.
2) Having an OGG-file with an authorized cover (Metablock_Picture) and then running DSP-Replaygain, the following happens:
The ReplayGain tags (4) are placed behind the coverart, which is correct.
The problem is, that the file is rewritten in UTF8, which corrupts the actual length of the image. (LengthField does not correspond to the actual length).

???

Regards
Thomas