if it was working fine before you may have to do a repair of SW.
Am I correct, that this problem shows up when you open SW as one user, but is OK, when you open as another user? If so, I think that indicates that you have problems with the first users registry settings. You could try copying the registry settings from the user without the problem to the user with the problem. Or you might have to delete the registry settings for the user with the problem. I don't remember how you do this, but searching in the forums on "registry settings" would probably find it.