For whatever reason all my Chrome extensions no longer work properly, all the icons are there, but when I click any of them the popup box is just a tiny square with no content. Restarting the browser, and disabling/re enabling them did not fix the problem.
Here is a screenshot:
This is using Chrome Version 27.0.1430.3 dev-m. Perhaps it is just a problem with this build, but I did not notice the problem directly following the last update, it has been a few day, so that seems unlikely.
However on the same machine running Version 27.0.1432.0 canary it works just fine.