Well...since you've (NOT) given us so much info about your OS, Java version, LW version, LW history (whether this has just started happening after installing a certain version of LW) then I wouldn't have a clue.

How could anyone have a clue?

If you give us some info then we might be able to help.

To find out which version of Java & LW you're using, open LW & click on Help > about LW.