Sometimes get contacted by a client because their Followers aren't showing or they can't upload an image. They usually say something like, "Everything was OK after you installed my design but all of a sudden my Followers are missing. HELP!"
I tell them that it is probably a temporary issue with Blogger. I find that as sudden as a problem like this starts, it will get fixed just as quickly. These issues aren't necessarily an issue with everyone's blog, but if you are having issues then most likely thousands of others are too. Just be patient and it will get fixed.
There are a few places you can check to see if Blogger is having issues. First is their Known Issues blog. This blog covers bugs and missing features in the new version of Blogger that affect a significant number of users. If you need more info on a particular issue, or would like to report a new one, please take a look at the Blogger Help Group. Please search before you post, as your issue may have already been reported.
For information about the state of the service and upcoming outages, see the Status blog.