Had an issue upgrading from 6.43.12 directly to 6.45.7 on a single RB1100AHx4 - the information in /ip ipsec peer wasn't properly split into the /ip ipsec peer and /ip ipsec identity parts, the latter was missing completely. In 6.43.12, auth-method pre-shared-key and pre-shared-key-xauth were used ...