The latest bbPress 2.2.x update calls the suggest JS in admin_head and enqueues the script separately, which results in admin_head loading up their JS but calling an undefined method. This errors out all GF pages, so you have to turn no-conflict mode OFF to get around this. Yes, no-conflict mode actually causes a conflict because their JS and admin_head is loaded on every admin page.
Just a general heads up to bbPress users, if you have no-conflict mode on, you're likely going to run into this issue. There may be frontend related issues too, I downgraded bbPress to 2.1.x quickly before digging in deeper.