I am having a very simliar problem with the new 4.9.0 Beta. When I try to start it up the program crashes and says

LimeWire version 4.9.0 Pro
Java version 1.5.0_03 from Sun Microsystems Inc.
Windows XP v. 5.1 on x86
Free/total memory: 464760/4861952

FATAL ERROR!

java.lang.ExceptionInInitializerError
at com.limegroup.gnutella.gui.library.LibraryMediator .<clinit>(LibraryMediator.java:64)
at com.limegroup.gnutella.gui.MainFrame.<init>(MainFr ame.java:104)
at com.limegroup.gnutella.gui.GUIMediator.<init>(GUIM ediator.java:167)
at com.limegroup.gnutella.gui.GUIMediator.instance(GU IMediator.java:268)
at com.limegroup.gnutella.gui.Initializer.initialize( Initializer.java:227)
at com.limegroup.gnutella.gui.GUILoader.load(GUILoade r.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.limegroup.gnutella.gui.Main.main(Main.java:32)
Caused by: java.lang.NullPointerException
at com.limegroup.gnutella.gui.library.LibraryTree.add PerMediaTypeDirectories(LibraryTree.java:206)
at com.limegroup.gnutella.gui.library.LibraryTree.<in it>(LibraryTree.java:138)
at com.limegroup.gnutella.gui.library.LibraryTree.<cl init>(LibraryTree.java:101)
... 11 more


-- listing session information --
Current thread: main
Active Threads: 13

-- listing threads --
Image Fetcher 3: 1
IconLoader: 1
NIODispatcher: 1
Image Fetcher 2: 1
Java2D Disposer: 1
TimerQueue: 1
main: 1
AWT-Shutdown: 1
AWT-Windows: 1
AWT-EventQueue-0: 1
Timer-0: 1
Image Fetcher 1: 1
Image Fetcher 0: 1


-- listing properties --
FILTER_HASH_QUERIES=true
APP_HEIGHT=560
FILTER_WHATS_NEW_ADULT=false
FRACTIONAL_UPTIME=0.28369242
LAST_EXPIRE_TIME=1118341930390
SESSIONS=290
RUN_ONCE=true
COUNTRY=
SHOW_TOTD=false
CLIENT_ID=BFABE4276D91A0E0FFB98B7A23588A00
LAST_SHUTDOWN_TIME=1119500500108
FREELOADER_FILES=1000
EVER_ACCEPTED_INCOMING=true
FREELOADER_ALLOWED=10
DISABLE_SUPERNODE_MODE=true
TOTAL_UPTIME=4650797
AVERAGE_UPTIME=16092
CONNECTION_VIEW_ENABLED=true
UNSET_FIREWALLED_FROM_CONNECTBACK=true
RUN_ON_STARTUP=false
APP_WIDTH=800
INSTALLED=true
LAST_GWEBCACHE_FETCH_TIME=1119466331578
CONNECTION_SPEED=350
WINDOW_Y=-4
BLACK_LISTED_IP_ADDRESSES=217.42.166.167
WINDOW_X=-4


Now what does that mean and how do i fix it. I've been itchen to try the new version of Limewire for a lil while now.