When trying to view or access the "Machine Catalog" node in Citrix Studio, it never finishes loading.
You see the spinning wheel loading animation but it never finishes.

After a few minutes you may see 1 of the following errors:
 "The supplied address for the computer resource is invalid."
Or
 "The requested channel timed out while waiting for a reply after..."

The "Hosting" node may also experience loading issues and produce error message:
"Cannot find path '...:\Connections\<resource name>...' because it does not exist"
 

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Install Rollup Pack 6 for Microsoft System Center 2012 R2 Virtual Machine Manager
https://support.microsoft.com/en-us/kb/3050317

NOTE: There are over 40 issues addressed by this update and some require creating registry keys on the server so please review the Microsoft Document completely before applying the update.

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Problem Cause

Caused by running an out of date Microsoft System Center 2012 R2 Virtual Machine Manager.