Don’t panic, there is a quick fix.
The recent update to versions around 3.01, 3.02 etc sometimes caused a problem where all the MaxButtons disappeared off the face of your website. The list of buttons behind the scenes in the dashboard looks empty too.
Worst of all, if you try to manually create a new button again, ti doesn’t save and appear in the list!
There is a really easy fix. All you have to do is to go into the plugins list in your dashboard, DEACTIVATE the MaxButtons plugin, then straight away REACTIVATE it again.
All the buttons magically reappear.
This is a timely reminder to make sure that your site is being backed up daily so you can always go back to the previous version temporarily when odd things like this happen.