IntelliJ IDEA 2017.1.1
Build #IC-171.4073.35, built on April 6, 2017
JRE: 1.8.0_112-release-b251 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Mac OS X 10.11.6
Now no editors or panes are shown in the main IDEA window. Disabling or uninstalling Code Review For IntelliJ IDEA 0.5.5 makes the problem go away.