When you say wipe the index, is it stored in the car then? I thought it used the iPod? There's an official 6FL thread somewhere - might be worth posting on that as all the 6FL woes come out there. The interface is a bit frustrating...I tend to leave it on random. Apparently you can edit the genre of your clips to have A,B etc. in it then if you go in genres you can easily get to the right letter. I would've preferred voice integration though, would seem a simple logical step for them to have done that.
Current: E90 335d (May 2007) | Black/Black | Prof Hifi | Prof Nav | 6FL | Fully Electric Seats | Xenons | Folding Mirrors | PDC
Previous: 325ci Conv. Black/Black with lots of ACS
Previous: z3 3.0 Silver with Black&Red Leather