Verified on CFME-5.9.3.1/RHV-4.2.3.5,
Followed steps 1-5 in the bug description:
1. Have RHV 4.1 added to cfme and a VM on it running.
2. Create a snapshot for that VM.
3. Shut down the VM. This has to be done in order to revert to a snapshot with RHV 4.1
4. Revert to the snapshot created in step 2
5. Try to revert to "Active VM" - This action is not allowed. The revert icon is disabled, and shows a help tool: "Revert is not allowed for a snapshot that is the active one".
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2018:2184