This change was implemented for a better experience when using screen-readers.
This was changed for the Lectora Desktop v18.1 release, and for the upcoming Lectora Online release (~Sept 2019)
“Initially hidden text is read when it is shown” is the Feature that went in. When the alt and title (hover text) attribute tags were set the screen readers read the button names three times. Screen-readers work great once we removed the alt and title tags (they read the button name only once).
Hover text is lost, but it is possible to make your own hover text in Lectora if it is absolutely necessary.
Please use this thread to discuss how this change affects you and what you are seeing. Again, the change was done to enhance the screen-reader experience. We do not see this as a bug and ask for your experiences and feedback to help guide any future modifications.