AIFF metadata problem

Hello,

When editing metadata for my ALAC/AIFF files, I use the Album Artist Sort Order field (i.e., Sort Album Artist in iTunes) so that artists like 10,000 Maniacs will alphabetize to "T" (i.e., Ten Thousand Maniacs). While I have had no problem with the metadata "embedding" in my ALAC files, I have found that this data embeds transiently in AIFF files (i.e., it will be there for a few days and then disappear).

Has anyone else experienced this issue? Does anyone know of a fix/workaround?

Thanks,

Tim