Options for remoting 11.4.x agents

Prior to 11.4, I had never had any problem using any vnc client to manage zcm agents (ultravnc, realvnc, remmina, tightvnc, tigervnc, etc).
After upgrading to 11.4.2 most of the vnc clients fail.

Is there any work around to 11.4 that would allow me to use something other than using the ZEN Remote Management Viewer to remote pcs?