Visual Studio may throw an error when trying to Debug a solution/project, or when selecting Debug the solution will buid (a succesful Build is reported to the status bar) but nothing else happens, the Debug doesn't start.

This is actually an error in Visual Studio an not something exclusive of Visual APL. To solve this:

1. Build sample Hello World code. (Something you KNOW works)
2. If error received, continue step three. No Error, close this page.
3. The Binding Handle Is Invalid - Open Start > Control Panel > Administrative Tools > Component Services > Services > Select Terminal Services. Right click properties, select Startup Type: Automatic. And if the service is not already started, Click the Start button.
4. Retry building your project or running the code. It should now work.

More information can be found here: http://blogs.msdn.com/habibh/archive/2005/11/10/491572.aspx