I've always had issues with melodyne version 3 (editor) where they blobs work sometimes when clicked, and then all of a sudden they stop working, and nothing can get it back until I reload sonar.  I really wish that would not happen, but I have not been able to find a solution. Fortunately its more an annoyance than a fatal error.

In the Melodyn menus , Options-Note Editor-Monitor When Editing Blobs must be checked.

Options-Note Editor-Monitor When Editing Blobs must be checked.
hmm, so far "Options" is not an option, here is the list:
settings, edit, algorithm, view, help (+ all the hidden icon based sub menus)

Sorry this is from Melodyn 4 I assume you are in 2. I do not remember where or if it was in 2. Why not update for free?
 

I did upgrade Melodyne Essential to:     
VST3 Melodyne editor singletrack.2.1.2  64 bit      
i did see a $99 upgrade, not free, where is that?