To fix the problem it would be useful to get a copy of the track in your music library that is killing RMM. Unfortunately locating this is a little long winded:

Split your library in half and scan it. If it scans OK, add in half of the other half, otherwise remove half of the first half. Repeat until you have identified the problematic track by means of binary chop.

Probably not what you want to hear, but if you do identify the problem track please send it to me.

Thanks

Rob