QtCreator 3.0.1 (on an Unbuntu system) appears to be merging stdout and stderr in my Compile Output pane, likewise errors don't appear in the Issue pane.

Tools | Options | Build & Run | General | "Merge stderr and stdout" checkbox is unchecked.

Any ideas on how to fix this?
I checked to see if my project has some sort of override of global system settings, but couldn't find this one.