The update to menulibre 2.1.5 appears to have broken menulibre with MATE (menulibre just does not show any menu entries at all: https://i.imgur.com/RaMzBcr.png)
If I downgrade to 2.1.4 it works without issue
also entered issue with menulibre: https://bugs.launchpad.net/menulibre/+bug/1748681