Hi Stevo--I've had the same message (non-fatal) installing the new beta versions on Mac OSX. The developers are aware of it, but LW is working fine so far. I'd guess it has to do with non-US English settings. So . . . don't mess further with your system?

Here's what I get:
class com.limegroup.install.SettingsTranslator.install() Unexpected Fatal Error:
java.lang.NoClassDefFoundError: com/sun/java/util/collections/Set
at com.limegroup.install.SettingsTranslator.install(S ettingsTranslator.java:31)
at com.zerog.ia.installer.actions.CustomAction.instal lSelf(Unknown Source)
at ZeroGt7.run(Unknown Source)