That's my guess. Encrypted pool. beta2->RC1 - on boot stuck on importing zfs pools. Rebooted to Beta1, delete pools, Boot to RC1, create pools with encryption, reboot to RC1 - stuck on importing pools. Fresh RC1 install, import pools from gui - reboot - stuck on importing.It seems encryption is a common factor. In the system I've been able to inspect, the middleware was stuck in a job trying to recursively unlock the pool.