LDAP Authentication

Group handling is what changed. On 1.5 a directory login receives one of two fixed tiers (admin or user) rather than per-group role mappings, and nested group support is a single AD-only checkbox rather than a choice of strategies.

Which version am I on?

Check FOG Configuration → FOG Settings → General → FOG_VERSION in the web UI, or the version string printed at the top of installfog.sh.