Yep I'd suggest updating your LW. Check my personal message. LW 4.8.1 is the latest version you can use on OSX 10.1.x
But there may also be another problem. Can you answer these questions please:
System details - help us to help you (click on link)
Edit: I've just realised you don't have personal messaging enabled. Oh well ... your loss. You can enable it under Edit Options in your User Control Panel. Send me a PM if you want 4.8.1