Steps to reproduce:
1. Create empty project w/ default layout
2. Turn on player settings and de-select automatic API for the platform you're on
3. Change the current API to any other
4. Try to press on console tab

Actual result: Nothing happens
Expected result: Console tab turns on

Workaround: Press on anything else first, then on console tab

Tested and reproduce on:
OSX 10.11.2
Unity 5.3.1p2, 5.4.0b1
Could not test on OSX with Unity 5.2 as it doesn't seem to have automatic API option for OSX

Windows 10
Unity 5.1.4f1, 5.2.4p1, 5.3.1p3, 5.4.0b2