Can't connect to the Hyper-V manager after upgrading to Windows Hyper-V 2012 R2

I have some Hyper-V server based on the free version (Windows Hyper-V 2012). I want to upgrade to the new version (Windows Hyper-V 2012 R2). So I begin to test it with
an already working server (aka I was able to totally manager the server remotely without problem) and so upgrade it to the R2.
After the upgrade, remote management and Hyper-V manager does not work anymore. So I redo my usual configuration steps (enable remote management, open firewall, uses
latest hvremote.wsf, etc.). I was able to regain access to Computer Manager but not the Hyper-V manager which still can't connect at all. I can't access the Task Scheduler too without having a lot of XML error like "The task XML contains a value which
is incorrectly formatted or out of range" (see below for screenshot).
Is there a new step to do to be able to manage Hyper-V 2012 R2 from a Windows 7 computer?
It's not a network problem as I can access RDP and MMC Computer Manager.
To be sure the problem is coming from the R2, I have taken an old computer, install Windows Hyper-V 2012, do my usual configuration step, and
tada: it works perfectly. I can access the Hyper-V manager from my client.
Technical details:
- Client is a Windows 7 SP1 x64 English member of a domain with latest RSAT (Windows6.1-KB958830-x64-RefreshPkg.msu).
- Servers are in a workgroup (not a domain's member). And no, I can't add them to the same domain as the client.

HI,
Can we upgrade HyperV 2012 to hyper v 2012 R2.
Thanks
Atul

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