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Annoyingly, I had to quit UE4 and restart it after recompiling to make the trigger volume editable. The hot reload wasn’t enough.
Now, I don’t know if this is a 4.17.2 thing, or if something went wrong in connecting VS2015 with the Unreal Editor in this session, or what. (I compiled both ways: from Unreal Editor and from inside VS2015.). But if you get stuck making the box editable, close and restart UE4 Editor to refresh. I wish there were a “Refresh” button for this purpose (and Refresh Nodes, recompiling blueprint, closing blueprint editor and reopening it, etc., didn’t work).
That sucks. Happens though occasionally. Good suggestion for others.
We could use check(TriggerVolume != nullptr)
or check(TriggerVolume)
too (of course if you don’t mind not needing a stack trace)!