I am running Fusion 10.0.1 on High Sierra (10.13.1). I have a Windows 7 VM with Visio 2010. In unity mode when Visio launches I get the application opening splash then nothing. If I view the VM Library the preview window shows Visio. If I switch Fusion to Single Window I see Visio. If I switch back to Unity it does not show. Other applications such as IE and Explorer work in unity without issue. I did not have this issue with Fusion 8.5