I have a problem with PyCharm v2.7.
it does not show me errors.
I have configured it to show them as [here](https://stackoverflow.com/questions/10703984/pycharm-error-highlighting)
but nothing.
here a screenshot of what I see (no error displayed)
![enter image description here](https://i.stack.imgur.com/p3yX5.png)

if I run code analysis it shows the errors marked as INVALID in the window but it does not highlight the code.
any idea?