None that have crashed my system Mattphoto but did have a couple it wouldn't recognize at first due to odd characters. I now keep two separate libraries on my home computer - one for all of my original music and another Ford Sync library. I used MusicBrainz Picard to go into the Sync library and rename the troublesome tags by hand (don't want to mess with my originals so that is why I have two separate libraries) in a manner more friendly to Sync/MFT. Worked for me.
Not sure if this is exactly what you are getting at here or the source of your issue but just thought I'd throw it out there.