application.js can't find jquery.ui.effect-blind
I ran into a similar issue and it turned out that at some point they started using jquery-ui instead of jquery.ui and / instead of . to include individual parts. Try using:
//= require jquery-ui/effect-blindEDIT:
In the recent version there is an extra effects in the path
//= require jquery-ui/effects/effect-blind
I had to change it to
//= require jquery-ui/effects/effect-blindThis seems to be the recent one.