Did you try restarting LW?

Did you name the themes folder using undercase letters? (should be called themes not Themes) Do you have any files inside the themes folder that have the .lwtp file extension? Usually there will be one of those files accompanied by a folder of similar name with all the supporting files for that particular skin.

On a similar topic to your issue with viewing, you can also change text size displayed on LW via the View menu.