IntelliJ missing all inspections

Question

I'm having an issue with IntelliJ, that I cannot seem to find a solution for myself. I have not changed any settings, yet when I started my IDE this morning, all Inspections and other highlighting has disappeared.

By highlighting, I mean stuff like variable names becoming purple, static finals shown with italic text, etc.

Inheritance seems to be broken as well, in that an implementing method links to the implemented interface method, but interface methods do not link to the implementing method.

My search for this tells me that there is an icon for this in the bottom right. That's set to "Inspections", and under configuration, it seems like everything is set to default.

Is there some way to un-break my IDE?

Answer 1

Another solution:

File -> Power Save mode

It needs to be disabled.