I installed the Pretty Presets Wonderland, and now when I try to log into Lightroom it won't let me access the developer tools any more and states my trial has expired. I purchased the full product. Also when I try to go to help to sign out, nothing happens. So I cannot log out in order to re-submit my license key.
Which version of Lightroom? Which operating system?
Have you also contacted the vendor of the presets to report the issue?