Originally Posted by phlegm
They are albums that I have imported using iTunes. For example, to illustrate my problem, if I delete an album that the folder has a letter B, then the album afterward that starts with a C will then be indexed.
Check your rip settings. Make sure that it's ripping to MP3 and not AAC (the default). Other than that... no clue. Maybe it just needs to be re-indexed? I don't have my car or the manual but I would think there's a way to force this. If nothing else, disconnecting the battery for a few minutes to clear the settings should do it.