In R80.40 management I have found a small glitch in verification:
When you push a APCL/URLF policy (inline layer) to a gateway, without APCL/URLF blades turned on, the verification does not stop the Policy install process with an error, it just hangs at 50%.
It shows as if it still busy but even after an hour it did not move. In my case it is on a MDS and the only way to recover is by rebooting the MDS. Stopping/starting the Domain does not help.
You cannot try to install again as it tells you there is a policy install in progress.
When the blades are turned on on the same gateway the policy pushes just fine (after a reboot).
Regards, Maarten