The Windows 10 Fall Creators Update (FCU) 1709 contains a bug that causes CreateWindow() and CreateWindowEx() to fail unpredictably. The bug prevents Visual Assist from rendering all components of its UI, and eventually causes Visual Studio to crash.
Microsoft has acknowledged the CreateWindow() bug and is investigating its cause, but the bug will not be fixed—at the earliest—until the December Patch Tuesday. If you want to use Visual Assist until Microsoft releases a fix, defer installation of the Windows 10 Fall Creators Update.
Separately, Microsoft broke Windows hook procedures in Windows 10 Build 15063.608, issued Sept 12th. The hook bug causes Visual Studio to crash intermittently, e.g. when opening certain dialogs of Visual Assist. Microsoft has acknowledged the bug and is scheduled to release a fix on November Patch Tuesday.
Stay tuned for our next announcement regarding the bugs.