After updating Unity to the new 2017.1.0f3 version, I can't see which line in a source file an exception occurred on.
I can't see the source of the error by double-clicking in the console either, which would usually redirect me to the source file in Visual Studio. I can still see exceptions from the Unity and Mono API.
I have managed to temporarily fix it by going to the PlayerSettings and switching "Scripting Runtime Version" from "Stable (.NET 3.5 Equivalent)" to "Experimental (.NET 4.6 Equivalent)".
This happens to all MonoBehaviour scripts.