I installed v11 on two computers with only 1 very minor problem. On one computer, "Mount" will display in context menu when I right click an ISO, and on the other computer it does not. Instead it shows "Always available offline". Why the difference and how can I get "Mount" to show up in the context menu of the second computer? One other bit of information; I installed the "xxx - Opus Config - 08-Mar-2014.ocb" backup from the computer that has the mount command in the context menu so I would have thought everything would be the same.
If you look in Settings -> File Types, do you have a .ISO file type on both machines?
Maybe PowerDVD created the missing .ISO file type which made things work. Windows 8 seems to ship with tools that handle aspects of file types like PDF and ISO but Microsoft forgot to actually create some of the types in the registry, it seems.
The ISO File Type was listed, but not associated with Windows Explorer (supposedly it was renamed to File Explorer in W8.1). Once I associated it with the File Explorer shortcut located here: C:\Users\XXX\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools, it started working after a reboot.