For the past few days, dozens of threads have been popping up in the Google Webmasters Help discussion forum about how Google Webmaster Tools was showing "Data is not available at this time" for some sites.
After many complaints, Google posted it as a known issue at 5am and then at 11am, they said it should be fixed by tomorrow (which is today).
I don't see any new complaints and no, I won't link to the 10 or so threads discussing the issue. Instead, I will link to just one.
Forum discussion at Google Webmasters Help.