Red Lines under all functions

For some reason, PyCharm just started red underlining any function I write, even in a fresh project.  The file still runs despite the lines.  It was not doing this this morning so I must have accidentally changed some setting but I have no idea what that could be. Has anyone ever seen this before?



There could be too many reasons to start shooting randomly.

Let's start with **File | Invalidate Caches / Restart... | Invalidate and Restart**, if it's not helping, please show some screenshots of the issue and your project structure.


   OK, here is a screen shot.  Invalidating the cache did not work.  This is a test project that I created just to see if I would get the red lines.  There is only one file that has one function.  Is there any possibility that a recent update to PyCharm has caused this?



For future reference for some poor soul in the future with the same problem, the answer is:

File | Manage IDE Settings | Restore Default Settings


That did it. 


A word of caution to future poor souls from the poor soul that had this issue and resolved it with Restore Default Settings

I should have expected it, but every config change I've ever made to my IJ environment is gone. It's got that new out-of-box smell...

This seems to be a safer first try:,241,-IntelliJ%20sometimes%20gets


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