I installed MATE desktop 1.16 on 16.04 according to the instructions in the Announcement post, and I noticed that after a restart, there are errors like the following in .xsession-errrors:
** (caja:2246): CRITICAL **: caja_menu_provider_get_background_items: assertion ‘CAJA_IS_MENU_PROVIDER (provider)’ failed
Have I got something misconfigured? I haven’t noticed anything not working. I’m using the Advanced Menu if that helps.