SNARB Thanks for letting us know. We just received a crash log that helped us locate the culprit. We'll fix this in the next update.
Work-around: You have one or more folders in your designated iTunes music folder (eg. on the hard drive) whose tracks are no longer present in your iTunes music library data (eg. in the database file). This folder (may be an artist or album folder) contains an underscore ("_") character, representing some "illegal" character, such as "é" or "à". If you can find this album/artist folder and either trash it, rename it or re-add it to your iTunes music library, you will no longer get the crash.
(Version 1.0)