I get a very strange issue with IntelliJ IDEA. Cli...

# random

[aaverin]

I get a very strange issue with IntelliJ IDEA.
Clicking on a run button near the tests shows up a popup "Nothing here", and I am also unable to run tests when I right-click on the test folder even.
Same happens when I right-click on a class that has main method - no Run option available.
But old configurations are still running correctly.

Any suggestion where should I search for solution?