Does that Krom error happen on any project?
I created a barebones project using init kha, set a breakpoint in the Project class the tried to debug by running with the krom target. First I get a popup asking if I want to allow the app to accept incoming connections, then if I press allow the app doesn't stop in the breakpoint even though it runs and even prints traces. But when I close the app it gives a "has closed unexpectedly" error message.
What macOS version is that?
El Capitan v10.11.6
Is that using the integrated Kha version?
Regarding the multiple shaders, do you have an example of how to use multiple render targets?