In the case this is a Java error (might have gotten corrupt or something), uninstall it the go to www.java.com and dld and re-install.
Trash preferences, possibly run Disk utility and restore permissions and try relaunching LW again.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-