Help: after last update (12.0.4) auto-import doesn't work anymore (python-plugin)

Hi

Yesterday I updated intellij to version 12.0.4

I'm using intellij with pycharm plugin to develop Python

Today the auto-import is not working anymore.

When I hit CTRL+SPACE on an unresolved reference it says "no suggestions"

I tried "invalidate cache", and I also rebuild my virtual env. In vain.

Please help, that's rather annoying.

If it is a bug and no fix available: can I switch back to version 12.0.3? How?

Many thanks