I just followed the new installation instructions for TF 1.9.0 and everything went smoothly until I re-enabled SIP as suggested. After a reboot, TF will not start and I am presented with an error message noting that “Apple Events cannot be delivered.” This is on Sierra 10.12.4 Beta (16E191a).
I will go back and partially disable SIP (–without debug) and see how that goes.
EDIT: Nope, that did not work. Rebooting into recovery OS and executing csrutil enable --without debug did not fix the problem. Still getting the same error message about Apple Events. I guess for now my only options are to roll back to an older TF version or completely disabling SIP.