I have the same problem on a Linux SuSE 8.0 system.
It's a fresh Limewire installation (no old versions)..

Limewire_Config.log gives the same error :
Custom Action: com.limegroup.install.SettingsTranslator
Status: ERROR
Additional Notes: ERROR - class com.limegroup.install.SettingsTranslator.install() Unexpected Fatal Error: