Intellisense in IntelliJ no longer working

Question

I\'m currently running IntelliJ IDEA 13.1. While running IntelliJ 13 intellisense/autocomplete stopped working. I tried upgrading and it still doesn\'t work.

I can e

Answer 1

In case this helps anyone; for me it was a windowing glitch of some kind. The suggestions popup showed on the wrong monitor, which I didn't notice the first time it happened.. after a while I saw what was happening. Resizing the window seemed to fix it.