I am experiencing a problem where the syntax and error highlighting in Intellij IDEA Ultimate 2016.2.4 is not working.
The only thing that is being highlighted are keywords like "public", strings and numbers.
You can also see that inspections are not being shown in the scrollbar:
I think this happened around the time when i upgraded from IntelliJ 15.x to 2016.2.4.
Is this a known issue or setting I accidentally triggered?