Almost no info on this bug but it appeared on a co-workers machine. Basically the Property window is empty and will not populate for any reason. The solution that appears to work is to do the following:

1. Go to start -> Programs -> Microsoft Visual Studio 2008 -> Visual Studio Tools -> Visual Studio 2008 Command Prompt

2. Once in there type the following: devenv /setup

3. Restart Visual Studios and you should be good.

Essentially what the command does is it  merges the resource metadata that describes menus, toolbars, and command groups from all VSPackages available.

link: http://msdn.microsoft.com/en-us/library/ex6a2fad(VS.80).aspx