Beginning August 2, 2016, Microsoft began rolling out a Windows 10 Anniversary Update(build 14393) to users of  Windows 10 automatically.  This update caused the PRO Landscape Proposal to stop working.  This update had no known issues with Image Editor, Planner or 3D Editor.  In Proposal, the update crashes the quote just before the Preview tab was to appear. Users that experience this problem and which are currently running PRO Landscape version 21 or version 22, may download a patch from the downloads page for their respective version.  Users on versions 20 and under will need to block Windows from automatic updates or revert to the previous build of Windows 10.  This is accomplished by going to Windows Settings >> Updates & Security.  If the update has been installed within the last 10 days, Microsoft will allow users to revert back to previous build.  Beyond 10 days users will need to upgrade to the latest version of PRO Landscape in order for Proposal to work. To determine if you have the Windows 10 Anniversary Update, type SYSTEM INFORMATION into the Window search box (or Ask Cortana box).  If the version build is 14393 or greater, you have the update.