Is LW properly connected (all green/blue connection bars)?
If you changed the license warning option, did you make sure to click Apply then ok to save the change?
After you deleted the prefs folder, did you have to go thru the setup wizard again?
Has your setup changed at all since things were working properly (eg new software, software upd@te/upgrade, new hardware)?
Please give us your system details.
System details - help us to help you -> Provide these details when you post!!!(click on link)