I’m getting a similar issue after updating this morning (I have already logged a ticket). I’m using a Themefuse theme (Core) and when the FF Manager plugin is active, my mega menu doesn’t work and most of my pages don’t load.
A few errors associated with this file /give-form-field-manager/assets/js/frontend/give-ffm-frontend.min.js:10:45707 appear in the error console. I thought it may have just been a cache/minfy issue, but turning everthing off doesn’t seem to make a difference.