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I take that you mean running IntelliJ under Java 7? JDK 7 and 8 work fine for development!

Exactly. I should've mentioned that. You can't run IDEA with only Oracle JRE 7. You need to install Apple's JRE 6 too.

I think it has to do with retina display support in the Oracle JRE 7.

I remember searching for retina display stuff in JDKs and saw a post from the people from JetBrains post differences between the JDK 6 from Apple and JDK 7 from Oracle. It was also a very informative post as well.

there is IntelliJ IDEA distribution with bundled JDK 7 (replace ideaIU-13.dmg with ideaIU-13-jdk-bundled.dmg in download link) but it isn't recommended because of JDK related issues

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