For the second issue all the following work for me:
- Press 'CD' twice (once to go to CD, once more to go to Media Player)
- Press the source button as described above
- Use the steering wheel controls to re-select the music
But then might be a different version of Blue&Me, my car is just over a year old now. And all cars seem to have an issue with the playlist corrupting. On mine this can only be fixed by putting a different USB drive in and then putting the original one back in again, forcing it to rebuild the list.