If you are currently still running MED-V 2.0, be very aware of a known issue. If you install the RDP/RDC 8.1 update for Windows 7 SP1, you may notice after installing the update, you are seeing application crashes of the MED-V Workspace. This update is labeled KB2830477. It was originally released last year and there were sporadic reports of problems with MED-V hosts running it. It has recently been re-released (February 11, 2014) and I have noticed many more reports of this occurring. This issue has been reported for both XP Mode and MED-V in the Technet forums as well.
Right now, there is an investigation ongoing. I would advise in the meantime that you do not install this update on MED-V hosts. If you have already installed this update on MED-V hosts and are experiencing the problem, you can simply uninstall the update and the issues should disappear.
Please note that this is an optional update. This update is not needed for MED-V or Windows 7 functionality. It is not a security update either. It may provide enhanced features if you need to connect your Windows 7 host to Windows Server 2012 or Windows Server 2012 R2-based RDP Sessions or RemoteApps.
Here is the subsequent KB article on the update:
KB2830477: “Update for RemoteApp and Desktop Connections feature is available for Windows”