Try it in a different account. Set up a fresh account & see if it installs there. If it does, it suggests a problem with your main account. Setting up a Test Account in OSX (click on link)

I was making the point the installers are fine. Not about the opening point.

When you suggest many, you suggest a high percentage, but in real terms it's a low percentage who may be having such issues. There's a 'lot' of osx users of LW out there. Not sure how many millions of LW users are out there at present, haven't checked the tally recently.

Edit: If same problems in a new account, then you could try an older version installer. Let us know what happens first.

BTW have you tried (a) repairing permissions after a safe boot, (b) repaired disk from installation disk. ? 1. http://www.gnutellaforums.com/genera...lease-add.html

2. Resolving Disk, Permission, and Cache Corruption (an older article)