Support Blocker/Custom Supports issue - Cura Lulzbot Edition 3.6.8

I just updated from 3.2.27 to 3.6.8 and tried to use Support Blocker/Custom Supports, but it doesn’t seem to work at all.

When I click an area of the model to add a block to, the block just falls to the buildplate and doesn’t do anything.

Turn off the option that automatically lowers the model to the build plate:

Preferences > Configure Cura > Viewport Behavior > Automatically drop models…
Screenshot from 2019-05-08 16-15-13.png

That did the trick, thanks!