Virtual Machine Connection has stopped working

Question

This is  happening on all our HyperV servers, can't connect to any of the VM's!! Causing real issues..
Problem signature:
  Problem Event Name: CLR20r3
  Problem Signature 01: vmconnect.exe
Problem Signature 02: 6.2.9200.16384
  Problem Signature 03: 50107744
  Problem Signature 04: vmconnect
  Problem Signature 05: 6.2.9200.16384
  Problem Signature 06: 50107744
  Problem Signature 07: 113
  Problem Signature 08: 29
  Problem Signature 09: System.ArgumentException
  OS Version: 6.2.9200.2.0.0.272.7
  Locale ID: 3081
  Additional Information 1: 7e1c
  Additional Information 2: 7e1c60eaa9cafa8f5166133e5ca186c8
  Additional Information 3: e543
  Additional Information 4: e5437ee7c4074423e7d9e9320dc5ba07
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Answer 1

I have the same problem.. Running hyper-v manager from win7 x64 client...
Problem details:
Description:
Stopped working
Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: vmconnect.exe
Problem Signature 02: 6.1.0.0
Problem Signature 03: 4ce75fbd
Problem Signature 04: vmconnect
Problem Signature 05: 6.1.0.0
Problem Signature 06: 4ce75fbd
Problem Signature 07: 107
Problem Signature 08: 29
Problem Signature 09: System.ArgumentException
OS Version: 6.1.7601.2.1.0.256.4
Locale ID: 1033
I have the exact same issue (running windows 2008 R2 Enterprise). I can RDP to any of the VM but simply cannot connect using console.  This is causing me grief since I have to create few more VMs and work with the existing VMs.  Without console
access, I cannot create and do any config changes for new VMs.  Can someone help. Things that I have tried so far.
1. Exported VMs
2 uninstalled .NET 4 & 3.5.
3. Hyper-v role removed.
4. Reinstalled Hyper-v, reinstalled .NET 4 & 3.5, patch current as of today.
5. Imported the VMs back and still cannot connect.  Exactly same error.  No errors in any logs in event viewer or Hyper-v logs. 
6.  Navigated to c:\Program Files\Hyper-v and manually run the VMCONNECT.EXE app (choosing the localhost/server and appropriate VM from the list) but no dice. The app just sits there for ever without any connection.
7.  I am baffled and surprised no one has a solution.  Tried multiple search engines.
8. The host machine is patch current as of today and there are no patches available to try.  Reading through some forums, I have also installed some hotfixes with no luck.
9. Finally, I can see the little graphic for each VM changing as windows is loading or stopping in server manager for hyper-v.
Hoping someone has a solution.  The error that pops up is exactly similar and no clues of the faulting module.
Appreciate your time and help.