My maven projects all started behaving badly. No auto-completion, no auto-importing of classes, syntax highlighting wasn't working - I was getting really annoyed. My initial thought was that the 12.1.5 update released last week must have been the culprit.
I was about to open a support case with JetBrains, when I noticed that an option called "Power Save Mode" was enabled (File menu, towards the bottom). I turned that off, and presto! Everything came back to normal.
Bottom line - don't use this feature. It makes IDEA slightly better than a text editor - especially in comparison to what it normally does for you.
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