Odd thing that's happened that I haven't encountered before... I'm developing a new C project for a Kinetis K24, the project compiles, links, and debugs fine. But the IDE has apparently lost track of where the standard header files are. Example from one of my main header files:
This then leads to all sorts of annoyance, especially when viewing code suggestions:
Why can the IDE suddenly no longer find the standard header files? Is there a simple way to investigate and fix this? Thanks.