I've had a problem like this a few times. Once the cause was permissions. Not sure on the details (possibly you need to have full access to the /tmp directory which you don't have when using a Standard user account I don't think) but using a user account of Admin status cured it when it was a permissions problem.

HTH someone. Probably won't because I've had the problem a few other times when I was using an Admin account so permissions wasn't the problem then.

Of course making an app that requires an Admin account to work, rather than a Sandard account, is the real cause and problem there. This was a little while ago so maybe LW has changed since.