Hi Chyman - that's almost certainly a bug in VMWare Player's Direct3D system.

In order to conserve video memory MoI normally only actually uses a single swapchain for the split view and redirects it as needed to the current viewport that's being drawn at that moment. That's totally supported by the real Direct3D system but it seems that Wine's Direct3D layer doesn't like to render a swapchain to different windows like that and sort of wants to lock each swapchain down to only being displayed in a single window.

I've been doing some work recently to make an option to use a separate swapchain for each individual viewport window instead of only using a single one which should help to avoid this bug.

- Michael