Hi Ivan - Yep, we had a publishing glitch yesterday. We use a configuration file to define all the refinements and scopes used on MSDN Search. That file was updated yesterday but somehow a blank file got pushed out to two of our servers.
With a blank file, we always search the entire Web. You might have also noticed that search refinements (e.g. the "Win32 & COM Development" you'd normally see when searching for SetClipboardData) were also missing.
Anyway, we fixed the problem a few hours ago and the default search scope, and refinements, are back to normal. Thanks for noticing and keeping us on our toes! :-)