Because the autorouter is useless (see other posts on this point), I am left with no other option than to attempt to route my board manually.
Sadly, it appears that the interactive router in CircuitStudio doesn't work either.
I can't get the interactive router to avoid obstacles. It keeps defaulting to "Ignore obstacles"... this seems like a bug. Even after I tab into the interactive router settings to deselect "Ignore Obstacles" checkbox, it apparently immediately decides that it should re-check that box silently without warning me.
I'm using CS V1.5.1 build 13
See the video for proof:
I was able to resolve this problem by selecting a different interactive routing mode from the Current mode dropdown menu in the interactive routing preferences dialogue that is shown in the video. Apprently, deselecting "ignore obstacles" is not enough.