WMT Instant Previews Broken?

[levo]

I get two blanks for "On-Demand Desktop Search Instant Preview" and "Mobile Search Instant Preview" on Instant Previews in WMT.

I can't find any issues with the website, no posts on Google support forums. No errors or anything..

Is it just me?

[optimierung]

We see the same for the websites we control (more than 16 websites)

[g1smd]

I noticed that a few days ago, but simply assumed the site owners had been fiddling with the site configuration again.