VS 2008 Intellisense missing: the key combination is bound to command which is not currently available

Intellisense has stopped working for my aspx files, and I've looked at the oth开发者_开发技巧er questions that address the issue with no solution.

When I try to format the aspx document (Ctrl-K, Ctrl-D) the status bar says "The key combination is bound to command (Format Document) which is not currently available."

The outlining is no longer showing up.

I have tried the /ResetSettings flag. I'm not using resharper. I've verified the settings (Tools -> Options, Text Editor) for both C#, Basic, and HTML as well as general.

How can I get this back?

I managed to fix this by switching to design mode and then clicking on the Source.

Strangely, I had to right-click to select design view, since the design/split/source options at the bottom of the window were not present.

Once I switched to design view, the buttons came back, and when I switched back to source view everything seems to work again.

Strange.