I started reverting my hosts back to U2 (VMware KB: Reverting to a previous version of ESXi). since I haven't received *ANYTHING* on my Support Request (which was shocking, usually support is great). I rolled back a host for testing and found that the guests are now only visible through the vSphere Web Client and not the vSphere Client. That might be specific to me, but who knows, just a heads up.
