Exchange 2013 Toolbox crashes when opening

Hi,

I have a hybrid 2010-2013 environment.  ECP, OWA on Exchange 2013 all work fine.  But when opening up the Exchange 2013 Toolbox, I get the following error:

Could not load file or assembly 'Microsoft.Exchange.Data.Directory, Version=14.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

I just recently updated the Exchange environment to CU11.

Any idea what can be causing this?

Thanks,

M