vSphere Client Console, VM guest only show in 1/4 of the console window

Hi all,

We have multiple hosts in vCenter, running different versions of ESXi, 5.0, 5.5 and 6.0, as such I have multiple vSphere clients installed on Windows 10 laptop.

When I attempt to connect to a Console of a VM guest, I see a really odd 1/4 screen view. The easiest way to explain this is with a picture. It doesn't matter if the guest is Windows, or a Linux console, the issue is the same. Any ideas?

Cheers

Chris