Thanks for your post. Can you please include the screenshot of the effects panel so that I can have a clear picture of the issue.
Be sure the search box is empty.
I had the same problem as Eduardo Restaño and found this page in search for answers.
I read your reply and thought: 'do you think he's an idiot? Of course the problem is not just the search box.
Well, i cleared the search box and voila, all transitions and lumetri looks are back.