verified using av10 "vm01: Cannot preview Active VM snapshot" verification - 1. create a snapshot for VM with disk 2. custom preview the active VM and active disk 3. click "ok' - get the warning message
tested using RESTAPI as well - attempting to preview Active VM snapshots returns the following message: ... <fault> <reason>Operation Failed</reason> <detail>[Cannot preview Active VM snapshot.]</detail> </fault> ...
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. http://rhn.redhat.com/errata/RHBA-2014-0960.html