Obscure Error: The File '' Could Not Be Refactored

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C#

Visual-Studio

WPF

Sometimes, I come across a property that, when I try to rename it using the built-in Visual Studio refactoring option, I get a dialog that says:

The file '' could not be refactored. Object reference not set
to an instance of an object.

Do you wish to continue with the refactoring?

[ ] Ignore further refactoring errors
                             [   Yes   ] [   No   ]

The dialog actually shows empty apostrophes when referring to the file. Google doesn't provide any help. I'm beginning to think this is an obscure Visual Studio bug and that I should report it to Microsoft Connect. Thought I'd see if any of you have come across it before first.

FYI, my solution/projects build fine. The property is not referenced in any XAML. I tried deleting my ".suo" file, my "bin" directory, and my "obj" folder, then rebuilding, but still no dice. I have the latest Microsoft updates. The problem occurs with both Visual C# 2008 Express and Visual Studio 2008 Professional. Though it should not matter, the property looks like this:

private MigrationRequestViewModel Request
{
    get;
    set;
}

I have no problem renaming other properties in the same class in the same file, such as this one:

private MigrationRequestViewModel RequestSnapshot
{
    get;
    set;
}

Any ideas? Note that I realize I could just find all reference to the property and manually rename it, but I'd like to get to the bottom of this error dialog.