After fiddling with Visual Studio setting, installing and reinstalling different Resharper nightly builds and stable builds, I just had a weird case where the keyboard shortcut combination for importing the namespaces disappeared.
In the settings, I could not find anything that even remotely resembled the setting I was looking for. After reinstalling the application again, it turns out that Alt+Enter combination is stored under
key. I'm posting it just in case it happens again. :)