Program compatibility issues
If VMware Workstation 12 is listed as the window tab, the virtual machine cannot be operated.
The developer of this app has no released an update in two years. Sadly, I think it is safe to assume this software is dead. Performance under Windows 10 is spotty at best. Newer apps may balk, as you noticed. With the developer gone and no access to the source code there is not much us users can do.