Try setting up a Test account & try opening LW from there & see if it has same problems. Sometimes problems can be account specific. Use your System Preferences to set up a new account.

In sample image below, you see I already have an account set up called Test. And one of the test accounts is active at that time. Easy to swap between accounts using login window at top right of screen.

(click to see larger view of sample image)

Next to mac clock is Account drop down menu so you can swap between accounts with ease:

(click to see larger view of sample image)
.