Try downloading the latest Java client from sun microsystems 1.4 i think they're up to. get it here http://java.sun.com/j2se/1.4/download.html

Windows XP shipped with java problems, that Sun Microsystems fixed ... d/l the XP compatable sun java client. Install it ... remove the 1.3 client ... restart limewire ... direct it to the proper client 1.4 ... no more flashing.