Thank you for the details.
My viewer is Win7 Pro 32-bit and my host is Win10 Home 64-bit.
Here is something I've discovered: after Windows has logged in if I toggle the toolbar's padlock setting (Lock input and screen) on and off, it then removes the wallpaper.
I've found there is one scenario where it removes the wallpaper after a Windows login: immediately after a start up. With every other scenario I've tested – e.g. resuming from lock/sleep/hibernation – it doesn't remove it.
Ok, we will test again this time using your configuration.
I've also found that screen blanking doesn't seem to be working either. As soon as the I move the mouse on the viewing machine the screen displays again on the host. Could this be part of the same problem?
Screen blanking requires the monitor driver to be installed. If you didn't install it during Host installation (the "Install monitor driver" checkbox is enabled by default), or just not sure , you can check this in the Host settings. Right-click the Host icon, select Settings for Host, then Options and Driver tab. Verify that the Monitor driver is installed (the Uninstall button should be active).
I'm curious though: if an application window is maximized, does the wallpaper's visibility still affect performance?
I'm not sure it will affect performance but I will ask our developers anyway.