Hi. Just retested. If you install fuji with ezflow package (with content but probably also with other packages) it seems ezjsselection is not loaded anywhere and this leads in a js error when trying to use front edition and toogle checkboxes functionality, for example when trying to add nodes to a ez flow block.
I think the problem comes because ezjsselection.js file it's only added to the backend. see design.ini file
to the content/browse.tpl template, and so, only load it when needed.
what do you think?
Do a fresh install of ez publish fuji community edition
log in the front site
edit your home
try to add some items to one of the blocks
in the browse template click the invert selection button.