How to fix problem with intellisense in Visual Studio 2008

The Problem: For whatever reason Intelliense in Visual Studio shows up for standard asp.net web controls appears on some pages and not on others.

The Cause: Visual Studio is a tricky little program, I have no idea why this happened. I went though the web.config files, encoding, rebooted and still got no resolution.

The Solution: Recreate the master page for the web form pages where the error occurs, then change the master page on those pages to the new master page. For whatever reason this works well. All told, it took me 45 minutes to get the problem resolved.