intellij navigate to file stopped working

Make sure your keymap is set to Default. You may be using different keymap, so go to File > Setting and search for Keymap. You can change it there.

Also try to verify if some plugins are updated, and disable them to try if some of them is the problem. In my case it was: Apache config (.htaccess) support Version 131.61

Try 11.1.2 build and File | Invalidate Caches. If it doesn't help, contact JetBrains support with a sample project to reproduce it.