This is just one of those things that I’m posting in case I see it again.
Was testing a Windows Forms app and, depending on which build configuration was being used, the Form_Load method wasn’t being called. Huh?
I don’t understand the internal mechanics of it, but the non-working build configuration was set to x86, while the working one was set to Any CPU, and this was on a x64 machine. Changed it to Any CPU for both, and we were fine.