Build failed due to validation errors in. dbml

OK so I got in today to find that I was unable to build my current project, I got the following

Error 1 Build failed due to validation errors in C:\xxx\DB.dbml. Open the file and resolve the issues in the Error List, then try rebuilding the project. C:\xxx\DB.dbml 2

I opened the projects dbml files to find that these files were fine, no errors or typos, the project was just dead. a little bit of Googling lead me to find that its a problem with Visual Studio 2008 not loading an assembly correctly, in particular the one with a GUID of 8D8529D3-625D-4496-8354-3DAD630ECC1B

In order to load the assembly correctly you need to get Visual Studio to reset it's packages, to do this:

1. Open a new command prompt
2. Navigate to C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE
3. Run Visual Sudio with the /resetskippkgs argument: devenv /resetskippkgs

You should now find that your project opens and builds correctly! I'm hoping that maybe SP1 of Visual Studio will correct this, if not SP2 maybe...

Update: SP1 Didn't fix this :( Also worth noting if you are running a 64 bit OS then the visual studio folder path is C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE