There was a little difference that made the examples run in the last release if you installed oemof locally but not if you installed it from pypi. Thus, they did not work with version 0.1.2.
Now we learned how to test them properly, applied a hotfix and released two versions again, due to superstitions (1.3 is almost a 13). The actual version is now v.0.1.4. It is not true but a nice story and due to the open philosophy errors like these fortunately show up really quick 
Have a look at the 0.1.2 release to see the real changes and stay tuned!