Updating your Java might fix it. Use the JRE offline installer & remove any other Java versions installed, before you install the new one.
Java SE Downloads

If that doesn't help, try reverting to an older Java. Someone recently had probs with LW graphics & found that going back to this version fixed things. Same deal - offline JRE etc
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 16

Otherwise, check out this thread for other info: LW loading blank and how i fixed it.