Go to Tools > Import and Export Settings > Reset.
It doesn't seem intuitive to me... but it worked. Knock on wood <smiles>

If all of the above didn’t work, it’s time to verify some configurations in Visual Studio itself. Go to Tools -> Options -> Text Editor -> All Languages -> General. Make sure “Auto List Members” is checked. Also, make sure “Parameter Information” is checked.
There are a few other configurations you should check out, too. Still under Text Editor, go to “Basic” and then “IntelliSense.” Make sure you have the following three checked:
- Show completion list after a character is typed
- Highlight matching portions of completion list items
- Show completion item filters
Close and reopen Visual Studio after the above